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Journal articles on the topic 'Equatorial coordinate system'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Templeton, G. H., G. B. Seibert, M. Ramanathan, S. S. Cassidy, and R. Johnson. "Left ventricular coordinate systems." American Journal of Physiology-Heart and Circulatory Physiology 257, no. 3 (1989): H1025—H1031. http://dx.doi.org/10.1152/ajpheart.1989.257.3.h1025.

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Three-dimensional kinematics of radiopaque markers in anterior, posterior, septal, and lateral regions of a major equatorial plane were evaluated in anesthetized dogs by biplane fluoroscopy. Stationary coordinate systems measured marker locations recorded during diastole and systole from a contractile origin at the center of contraction at end systole and from a geometric origin at the intersection with the equatorial plane of the ventricular long axis at end diastole. A time-indexed system measured marker locations at end diastole and at end systole, respectively, from the locations of the ge

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Mirzakandova, S.Kh., N.T. Namozova, and G.I. Sayfullaeva. "METHODOLOGY TEACHING TOPIC ON ASTRONOMY STAR ATLASES." Journal of Academic Research and Trends in Educational Sciences 1, no. 2 (2022): 14–17. https://doi.org/10.5281/zenodo.5837961.

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In the equatorial system, the coordinates of the stars are not associated with the daily motion of the celestial sphere and change very slowly, since they are far enough from us. Therefore, it is this coordinate system that is used to compile star globes, maps and catalogs.

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3

Peruansky, S. S. "On the Definition of an “Inertial Coordinate System”." Symposium - International Astronomical Union 141 (1990): 95. http://dx.doi.org/10.1017/s007418090008640x.

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Astrometry is a branch of science which develops methods for the quantitative descriptions of places and time instants of astronomical events on the basis of observations of celestial bodies. For this purpose a theoretical coordinate system is introduced (e.g. equatorial a, α, δ). The aim of astrometry is to apply this system to the observed reference objects (stars, planets etc.) so that their coordinates α(t), δ(t) can be calculated according to the relations α(t) =f1(Pk, t-to) and δ(t) =f2(Pk, t-to) where Pk are parameters, to is the conventional time instant and t is the current time. In o

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4

Zhen, Yan, Wu Zuyu, Zhu Ninghui, Yuan Ligen, and Chen jing Yu. "MATLAB modelling of double sided photovoltaic cell module." Power Electronics and Drives 6, no. 1 (2021): 12–25. http://dx.doi.org/10.2478/pead-2021-0002.

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Abstract In this paper, the equatorial coordinate system is taken as the celestial coordinates, the double-sided photovoltaic module irradiance model is established by using the MATLAB simulation software, and the double-sided photovoltaic module irradiance model is combined with the photovoltaic module model (Jianhui (2001)) to form the mathematical model of the real-time generation system of double-sided photovoltaic modules. The effectiveness of the simulation model was verified by building an experimental platform, and the output characteristics of the optimal line spacing between the doub

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5

Golovashchenko, V. A., and S. V. Kolomiyets. "METEOR OBSERVATIONAL DATA VISUALISATION IN THE EQUATORIAL COORDINATE SYSTEM USING INFORMATION TECHNOLOGY." Odessa Astronomical Publications 30 (November 17, 2017): 166–69. http://dx.doi.org/10.18524/1810-4215.2017.30.115454.

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Yan, H. J., and E. Groten. "Departure Point, Earth's Rate of Rotation and Coordinate Transformation in Quasi-Inertial Geocentric Equatorial Coordinate System (QIGECS)." Symposium - International Astronomical Union 156 (1993): 363–69. http://dx.doi.org/10.1017/s0074180900173516.

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The paper summarizes the discussion on the origin of right-ascension and puts forward new arguments in view of high-precision Geodesy and Astrometry. From the movement of the Celestial Departure Point, the classical right-ascension precession might be amended by an additional term −0s.000257/century originating from the nutation-precession interaction movement. A similar term might also be introduced in the maintenance of a terrestrial reference system, while the concept of a Terrestrial Departure Point is considered. The definition of the Earth's rate of rotation in an inertial or quasi-inert

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7

Guseva, Irina S., Alexandr Ju Kogan, and Vladimir N. Heifets. "Ecliptical Coordinate System as the Basis of Regatta–Astro Space Astrometry Program." International Astronomical Union Colloquium 127 (1991): 276–79. http://dx.doi.org/10.1017/s0252921100063983.

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One of the most important problems of modern astrometry is constructing of an ideal inertial coordinate system. A bulk of up–to–date star catalogues is referenced to an equatorial frame, which is far from being really inertial, Some attempts were made to remove this defect by excluding both nutation and precession in right ascention [Guinet 1979, Murray, 1990]. This proposal seams to be a compromise between the existing tradition and the new requirements met by the modern astrometry.

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8

Zakarevičius, Algimantas, Vladislovas Česlovas Aksamitauskas, Algimantas Jakučionis, and Arminas Stanionis. "DETERMINATION OF GEOGRAPHIC POSITION OF OBJECT BY APPLYING 3D POLAR OBSERVATIONS." Aviation 14, no. 2 (2010): 43–48. http://dx.doi.org/10.3846/aviation.2010.07.

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The geographic position of an object is determined by geodetic latitude, geodetic longitude, geodetic and normal height, and height of the object above the surface of the earth. To determine the geographic position of an object, a technologic scheme is recommended: by applying 3D polar observations, the 3D Cartesian coordinates of the object in the local horizontal coordinate system (for example, with an airport runway tied system) are determined; local horizontal 3D Cartesian coordinates are recomputed into the system of geocentric equatorial 3D Cartesian coordinates; the geodetic coordinates

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9

Fujimoto, M., and E. Grafarend. "Spacetime coordinates in the geocentric reference frame." Symposium - International Astronomical Union 114 (1986): 269–76. http://dx.doi.org/10.1017/s0074180900148284.

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A geocentric relativistic reference frame is established which is close to the conventional non-relativistic equatorial frame of reference. Within post-Newtonian approximation the worldline of the geocentre is used to connect points by spacelike geodesics on the equal proper time hypersurface and to establish a properly chosen tetrad reference frame. Points on the earth surface and near the earth-space are coordinated making use of the Frobenius matrix of integrating factors which connects the geocentric orthonormal tetrad with the tangent spacetime of relativistic pseudo-Riemann geometry. The

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10

Gorshkov, A. V., and E. Yu Prosviryakov. "Stagnation points of an inhomogeneous solution describing convective Ekman flow in the oceanic equatorial zone." Diagnostics, Resource and Mechanics of materials and structures, no. 1 (February 2022): 52–66. http://dx.doi.org/10.17804/2410-9908.2022.1.052-066.

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An inhomogeneous analytical solution describing a stratified large-scale isothermal Ekman–Poiseuille flow of a viscous incompressible fluid in the equatorial zone is obtained. A set of stagnation points of this solution is studied. Temperature is set at the flow boundaries. Tangential stresses simulating the effect of wind are specified at the free boundary. The Navier slip conditions are specified on the solid surface. The solution is constructed in the form of functions, linear in horizontal coordinates, with the coefficients dependent on the vertical coordinate. The coefficients of the line

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11

Smith, G. Louis, and David R. Doelling. "Computation of Radiation Budget on an Oblate Earth." Journal of Climate 27, no. 19 (2014): 7203–6. http://dx.doi.org/10.1175/jcli-d-14-00058.1.

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Abstract The effects of the earth’s oblateness on computation of its radiation budget from satellite measurements are evaluated. For the Clouds and the Earth’s Radiant Energy System (CERES) data processing, geolocations of the measurements are computed in terms of the geodetic coordinate system. Using this system accounts for oblateness in the computed solar zenith angle and length of day. The geodetic and geocentric latitudes are equal at the equator and poles but differ by a maximum of 0.2° at 45° latitude. The area of each region and zone is affected by oblateness as compared to geocentric

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Karelin, A., O. Adriani, G. Barbarino, et al. "The large-scale anisotropy with the PAMELA calorimeter." ASTRA Proceedings 2 (October 2, 2015): 35–37. http://dx.doi.org/10.5194/ap-2-35-2015.

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Abstract. The large-scale anisotropy (or the so-called star-diurnal wave) has been studied using the calorimeter of the space-born experiment PAMELA. The cosmic ray anisotropy has been obtained for the Southern and Northern hemispheres simultaneously in the equatorial coordinate system for the time period 2006–2014. The dipole amplitude and phase have been measured for energies 1–20 TeV n-1.

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13

Soares, J., I. Wainer, and N. C. Wells. "Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries." Annales Geophysicae 17, no. 6 (1999): 812–26. http://dx.doi.org/10.1007/s00585-999-0812-z.

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Abstract. A baroclinic shallow-water model is developed to investigate the effect of the orientation of the eastern ocean boundary on the behavior of equatorial Kelvin waves. The model is formulated in a spherical polar coordinate system and includes dissipation and non-linear terms, effects which have not been previously included in analytical approaches to the problem. Both equatorial and middle latitude response are considered given the large latitudinal extent used in the model. Baroclinic equatorial Kelvin waves of intraseasonal, seasonal and annual periods are introduced into the domain

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Eglitis, Ilgmars, and Vitaly Andruk. "Astrometry and photometry of digitized plates of Baldone Schmidt telescope." Open Astronomy 30, no. 1 (2021): 12–23. http://dx.doi.org/10.1515/astro-2021-0002.

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Abstract During the 40-year photographic period of astronomical observations, the Baldone Astrophysical Observatory has accumulated more than 22,000 direct and 2,500 spectral images. In 2018, the digitization of direct astrophoto images with a resolution of 1200 dpi was completed. A processing methodology for obtaining the equatorial coordinates and photometric characteristics of the objects recorded in digitized astronegatives using the LINUX/MIDAS/ROMAFOT environment has been developed at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. Program package with s

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15

Dürr, Katharina, Denis A. Yalalov, Frank W. Heinemann, Svetlana B. Tsogoeva, and Ivana Ivanović-Burmazović. "A Novel Five-coordinate Mn Complex with a Redox-active SNNNS Ligand System." Zeitschrift für Naturforschung B 65, no. 3 (2010): 258–62. http://dx.doi.org/10.1515/znb-2010-0306.

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Synthesis and characterization of a manganese complex of a new redox-active diaminocyclohexane derivative of a thiourea-based ligand with SNNNS donor atom set is reported. The molecular structure of the complex exhibits a pentadentate SNNNS ligand coordinated in the neutral form to the Mn(II) center. The coordination around the central metal is best described as distorted trigonal bipyramidal with the pyridine nitrogen and the two sulfur atoms being in the equatorial plane and the remaining two nitrogen donors occupying the apical positions of the bipyramid. Cyclic voltammetry in DMSO shows th

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16

Kareem, Mustafa Najat, and Wafaa Hasan Ali Zaki. "Gravitational Perturbation Influence on High Altitude Satellite for different Inclination." NeuroQuantology 20, no. 4 (2022): 82–98. http://dx.doi.org/10.14704/nq.2022.20.4.nq22098.

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Satellites have become such a vital part of our daily lives that we take for granted many of their functions, such as global positioning system (GPS) navigation and images of weather systems collected from orbit. In this work, The analytical method for third body perturbation on high Earth orbit satellites was investigated in this study for different inclinations (𝑖 = 1.71, 𝑖 = 5, 𝑖 = 10, 𝑖 = 23, 𝑖 = 25) across two revolution periods computed for short and long periods, Using the program celestial mechanics version 1 module (Beutler 2005) with input data given by the Two-Line Elements (TLE) cr

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17

Perez, Renellys C., Meghan F. Cronin, and William S. Kessler. "Tropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue*." Journal of Physical Oceanography 40, no. 9 (2010): 2091–106. http://dx.doi.org/10.1175/2010jpo4366.1.

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Abstract Shipboard measurements and a model are used to describe the mean structure of meridional–vertical tropical cells (TCs) in the central equatorial Pacific and a secondary circulation associated with the northern front of the cold tongue. The shape of the front is convoluted by the passage of tropical instability waves (TIWs). When velocities are averaged in a coordinate system centered on the instantaneous position of the northern front, the measurements show a near-surface minimum in northward flow north of the surface front (convergent flow near the front). This convergence and inferr

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18

Flin, Piotr. "The Orientation of Galaxies in Superclusters." Symposium - International Astronomical Union 130 (1988): 239–41. http://dx.doi.org/10.1017/s0074180900136095.

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The alignment of galaxies with the main plane of supercluster can contribute to recovering information on the structure origin. The positive result of the preliminary search for galaxy alignment in the Local Supercluster /Flin and Godlowski 1986, hereafter FG/ have stimulated further studies. Following Jaaniste and Saar /1977/, the both parameters, the position angle of the galaxy major axis p and the axial ratio b/a of the galaxy image, were used for the better determination of the actual spatial orientation of the galaxy disc. This approach also permit to consider “face-on” objects, whose di

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19

Minglibayev, M. Zh, and S. B. Bizhanova. "TRANSLATIONAL-ROTATIONAL MOTION OF A NONSTATIONARY AXISYMMETRIC BODY." PHYSICO-MATHEMATICAL SERIES 2, no. 336 (2021): 131–37. http://dx.doi.org/10.32014/2021.2518-1726.32.

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A nonstationary two-body problem is considered such that one of the bodies has a spherically symmetric density distribution and is central, while the other one is a satellite with axisymmetric dynamical structure, shape, and variable oblateness. Newton’s interaction force is characterized by an approximate expression of the force function up to the second harmonic. The masses of the central body and the satellite vary isotropically at different rates and do not occur reactive forces and additional rotational moments. The nonstationary axisymmetric body have an equatorial plane of symmetry. Thu

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20

Kosek, Wiesław, Waldemar Popiński, Agnieszka Wnęk, Krzysztof Sośnica, and Maria Zbylut-Górska. "Analysis of Systematic Errors in Geocenter Coordinates Determined From GNSS, SLR, DORIS, and GRACE." Pure and Applied Geophysics 177, no. 2 (2019): 867–88. http://dx.doi.org/10.1007/s00024-019-02355-5.

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Abstract The goal of this paper is to determine and analyze the common geocenter signal from the geocenter coordinates based on four independent techniques: Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), Global Navigation Satellite System (GNSS), Gravity Recovery And Climate Experiment with the ocean bottom pressure model, and Satellite Laser Ranging, and to analyze the residuals as the differences between these geocenter coordinates and their common signal. Another objective of this paper is to compute variable amplitudes and phases of the annual and semi-annual os

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Akhmetov, Volodymyr S., Peter N. Fedorov, and Anna B. Velichko. "The PMA Catalogue as a realization of the extragalactic reference system in optical and near infrared wavelengths." Proceedings of the International Astronomical Union 12, S330 (2017): 81–82. http://dx.doi.org/10.1017/s174392131700607x.

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AbstractWe combined the data from theGaiaDR1 and Two-Micron All Sky Survey (2MASS) catalogues in order to derive the absolute proper motions more than 420 million stars distributed all over the sky in the stellar magnitude range 8 mag < G < 21 mag (Gaia magnitude). To eliminate the systematic zonal errors in position of 2MASS catalogue objects, the 2-dimensional median filter was used. The PMA system of proper motion has been obtained by direct link to 1.6 millions extragalactic sources. The short analysis of the absolute proper motion of the PMA stars Catalogue is presented in this work

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22

Youngs, Madeleine K., and Gregory C. Johnson. "Basin-Wavelength Equatorial Deep Jet Signals across Three Oceans." Journal of Physical Oceanography 45, no. 8 (2015): 2134–48. http://dx.doi.org/10.1175/jpo-d-14-0181.1.

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AbstractEquatorial deep jets (EDJs) are equatorially trapped, stacked, zonal currents that reverse direction every few hundred meters in depth throughout much of the water column. This study evaluates their structure observationally in all three oceans using new high-vertical-resolution Argo float conductivity–temperature–depth (CTD) instrument profiles from 2010 to 2014 augmented with historical shipboard CTD data from 1972 to 2014 and lower-vertical-resolution Argo float profiles from 2007 to 2014. The vertical strain of density is calculated from the profiles and analyzed in a stretched ver

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Polozhentsev, D. D., H. I. Potter, L. I. Yagudin, J. A. Zelaya, and R. F. Zalles. "Contribution of Soviet-Bolivian Astronomical Observatory in the Construction of the Inertial Coordinate System." Symposium - International Astronomical Union 141 (1990): 96. http://dx.doi.org/10.1017/s0074180900086411.

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The work on photographic astrometry in Bolivia begun in 1983, when an expeditional astrograph was put there (D=23 cm, F=230 cm, working field of 4°x4°). The main purpose of the observations with this telescope is extending the inertial coordinate system to different classes of stars. For this purpose we have carried out and are currently carrying out the following observational astrometric programs:1. The preliminary catalog of precise positions of 200 000 southern stars to mag 11 with declination in the range from 0° to −90° was created. Each star was observed four times with displacement of

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Huang, Chuan Jiang, Wei Wang, and Rui Xin Huang. "Climate Variability in the Equatorial Pacific Ocean Induced by Decadal Variability of Mixing Coefficient." Journal of Physical Oceanography 37, no. 5 (2007): 1163–76. http://dx.doi.org/10.1175/jpo3060.1.

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Abstract The circulation in the equatorial Pacific Ocean is studied in a series of numerical experiments based on an isopycnal coordinate model. The model is subject to monthly mean climatology of wind stress and surface thermohaline forcing. In response to decadal variability in the diapycnal mixing coefficient, sea surface temperature and other properties of the circulation system oscillate periodically. The strongest sea surface temperature anomaly appears in the geographic location of Niño-3 region with the amplitude on the order of 0.5°C, if the model is subject to a 30-yr sinusoidal osci

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Hagino, Takeshi, Yuichiro Yokoyama, Yutaka Kuriyama, and Han Haitjema. "Sphericity Measurement Using Stitching Interferometry." Key Engineering Materials 523-524 (November 2012): 883–88. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.883.

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A newly developed practical sphericity measurement system by means of stitching interferometry is described in this paper. Spheres are widely used in industry. In particular, spheres with stem are usually used in metrological applications such as reference sphere for Coordinate Measuring Machines. It is common to calibrate form of spheres with tactile roundness measurement, however a comprehensive form measurement is desired for evolving high precision applications. The developed system consists of commercial base Fizeau type interferometer to capture partial surface areas of sphere and five a

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Onyiriuka, Emmanuel C., Steven J. Rettig, Alan Storr, and James Trotter. "Synthesis, characterization, and crystal and molecular structures of the coordination compounds, [Me2Ga•O(C5H3N)CH2NMe2] and [Me2Ga•O(C9H6N)]2." Canadian Journal of Chemistry 65, no. 4 (1987): 782–88. http://dx.doi.org/10.1139/v87-133.

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Crystals of (2-dimethylaminomethyl-3-pyridolato)dimethylgallium are monoclinic, a = 13.443(3), b = 6.7563(3), c = 13.046(2) Å, β = 100.38(1)°, Z = 4, space group I2/m, and those of bis[(8-quinolinolato)dimethylgallium] are monoclinic, a = 9.7340(4), b = 12.7135(5), c = 9.6843(4) Å, β = 117.014(3)°, Z = 2, space group P21/c. Both structures were solved by conventional heavy atom methods and were refined by full-matrix least-squares procedures to R = 0.044 and 0.032 for 1485 and 1567 reflections with I ≥ 3σ(I), respectively. The structure of [Me2Ga•O(C5H3N)CH2NMe2] consists of discrete monomeric

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Koval, Ludmila, Viktoriya Dyakonenko та Olherd Shtokvysh. "STRUCTURE OF THE ADUCT WITH TERT-BUTYLACETOAСETATE OF THE AQUA COMPLEX OF BIS(TERT-BUTYLACETOACETATO)NICKEL(II)". Ukrainian Chemistry Journal 91, № 1 (2025): 12–17. https://doi.org/10.33609/2708-129x.91.1.2025.12-17.

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A new compound, an adduct of the aqua complex of bis(tert-butylacetoacetato)Ni(II) with the starting β-ketoester, was synthesized and characterized by X-ray analysis. According to structural data, the crystal system is triclinic, space group P1–, a = 10.0383(12) Å, b = 11.3490(10) Å, c = 13.5420(15) Å, α = 87.323(7)º, β = 78.609(8)°, γ = 87,412(7)º. The molecular structure corresponds to the formula [Ni2(C8H13O3)4(H2O)2.2C8H14O3]. In the crystal, the nickel binuclear complex is in the form of a co-crystal with tert-butylacetoacetate with a ratio of 1:2. The coordination polyhedra of Ni atoms a

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Akhmetov, V. S., P. N. Fedorov, V. S. Tsvetkova, and E. Yu Bannikova. "Analysis of modern astrometric catalogues in the Gaia era." Monthly Notices of the Royal Astronomical Society 505, no. 3 (2021): 3219–27. http://dx.doi.org/10.1093/mnras/stab1602.

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ABSTRACT We investigate the systems of proper motions of stars in the ground-based catalogues HSOY, UCAC5, GPS1, and PMA derived by combining with the Gaia DR1 space data. Assuming the systematic differences of stellar proper motions of two catalogues to be caused by the mutual solid-body rotation and glide of the coordinate systems produced by the data of the catalogues under comparison, we analyse the components of the mutual rotation vector and displacement of the origins of these systems. The equatorial components of the vector of mutual rotation velocity of the compared coordinate systems

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Pomazan, A. V., N. V. Maigurova, and O. M. Kozhuhov. "TIME AND GEOLOCATION UNCERTAINTIES AS COMPONENTS OF THE ACCURACY OF NEAS’ GROUND-BASED OBSERVATIONS." Odessa Astronomical Publications 35 (December 14, 2022): 77–80. http://dx.doi.org/10.18524/1810-4215.2022.35.268214.

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The one of main tasks for solving the as teroid-cometary hazard problem is cataloging all objects that might come extremely close to Earth and pose a poten tial threat of collision. The reliability of their orbits significantly depends on the quality and the statistical treatment of astrometric observations, which are obtained by different observers and different techniques. Statistical analysis of the IAU MPC observational array of the small Solar system bodies and the development of a scheme for assigning weights to individual observation sets are im portant for performing asteroid orbit det

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Afonin, A. A., A. S. Sulakov, M. S. Maamo, and N. A. Shapovalov. "The development and evaluation of a combined initial alignment algorithm for strapdown inertial navigation system." Journal of Physics: Conference Series 2373, no. 7 (2022): 072023. http://dx.doi.org/10.1088/1742-6596/2373/7/072023.

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Abstract This paper proposes a combined initial alignment algorithm for strapdown inertial navigation system, in which the initial alignment is carried out in two stages during the process of preflight preparations while the aircraft is not moving. This method of initial alignment has the advantages of being conducted based on the Earth’s equatorial (Greenwich) coordinate system, which is also used by the aircraft onboard navigation system. In the first stage, the coarse initial alignment is carried out, and this is done according to the orientation parameters using the vector matching method.

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Harrison, M. J., and R. W. Hallberg. "Pacific Subtropical Cell Response to Reduced Equatorial Dissipation." Journal of Physical Oceanography 38, no. 9 (2008): 1894–912. http://dx.doi.org/10.1175/2008jpo3708.1.

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Abstract Equatorial turbulent diffusivities resulting from breaking gravity waves may be more than a factor of 10 less than those in the midlatitudes. A coupled general circulation model with a layered isopycnal coordinate ocean is used to assess Pacific climate sensitivity to a latitudinally varying background diapycnal diffusivity with extremely low values near the equator. The control experiments have a minimum upper-ocean diffusivity of 10−5 m2 s−1 and are initialized from present-day conditions. The average depth of the σθ = 26.4 interface (z26.4) in the Pacific increases by ∼140 m after

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Zaharia, S., C. Z. Cheng, and K. Maezawa. "3-D force-balanced magnetospheric configurations." Annales Geophysicae 22, no. 1 (2004): 251–65. http://dx.doi.org/10.5194/angeo-22-251-2004.

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Abstract. The knowledge of plasma pressure is essential for many physics applications in the magnetosphere, such as computing magnetospheric currents and deriving mag-netosphere-ionosphere coupling. A thorough knowledge of the 3-D pressure distribution has, however, eluded the community, as most in situ pressure observations are either in the ionosphere or the equatorial region of the magnetosphere. With the assumption of pressure isotropy there have been attempts to obtain the pressure at different locations,by either (a) mapping observed data (e.g. in the ionosphere) along the field lines of

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Ratovsky, K. G., M. V. Klimenko, A. M. Vesnin, and K. V. Beluchenko. "Reference responses of regional electron content to strong geomagnetic events." PHYSICS OF AURORAL PHENOMENA 47, no. 1 (2024): 24–27. https://doi.org/10.51981/2588-0039.2024.47.005.

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The paper presents an analysis of reference responses of regional electron content to strong geomagnetic events identified by the AE-index. As an ionospheric characteristic, we used the regional electron content (REC), which is the average total electron content (TEC) for five latitude zones in the corrected geomagnetic coordinate system: the mid-latitude zones in both hemispheres, the high-latitude zones in both hemispheres, and the equatorial zone. The relative (percentage) deviation of observed values from the 27-day running average REC was used to calculate disturbances of REC (ΔREC). The

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Wang, A., Y. Du, W. Zhuang, and Y. Qi. "Correlation between subsurface high-salinity water in the northern South China Sea and the North Equatorial Current–Kuroshio circulation system from HYCOM simulations." Ocean Science 11, no. 2 (2015): 305–12. http://dx.doi.org/10.5194/os-11-305-2015.

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Abstract. The North Pacific Tropical Water (NPTW), characterized by subsurface high salinity, is observed in the South China Sea (SCS) and is often used as an indicator of the water intrusion from the northwestern Pacific into the SCS. Based on the assimilation product from a global high-resolution Hybrid Coordinate Ocean Model (HYCOM) from 2008 through 2013, this study investigates the seasonal variability of subsurface high-salinity water (SHSW) in the northern SCS and its relationship with the North Equatorial Current–Kuroshio circulation system. Results show that the obvious seasonal varia

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Coley, W. R., R. A. Stoneback, R. A. Heelis, and M. R. Hairston. "Topside equatorial zonal ion velocities measured by C/NOFS during rising solar activity." Annales Geophysicae 32, no. 2 (2014): 69–75. http://dx.doi.org/10.5194/angeo-32-69-2014.

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Abstract. The Ion Velocity Meter (IVM), a part of the Coupled Ion Neutral Dynamic Investigation (CINDI) instrument package on the Communication/Navigation Outage Forecast System (C/NOFS) spacecraft, has made over 5 yr of in situ measurements of plasma temperatures, composition, densities, and velocities in the 400–850 km altitude range of the equatorial ionosphere. These measured ion velocities are then transformed into a coordinate system with components parallel and perpendicular to the geomagnetic field allowing us to examine the zonal (horizontal and perpendicular to the geomagnetic field)

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Cao, Gang, and Xiongbang Yang. "The Energy-dependent Gamma-Ray Light Curves and Spectra of the Vela Pulsar in the Dissipative Magnetospheres." Astrophysical Journal 962, no. 2 (2024): 184. http://dx.doi.org/10.3847/1538-4357/ad1f67.

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Abstract We study the pulsar energy-dependent γ-ray light curves and spectra from curvature radiation in the dissipative magnetospheres. The dissipative magnetospheres with the combined force-free (FFE) and Aristotelian are computed by a pseudo-spectral method with a high-resolution simulation in the rotating coordinate system, which produces a near-FFE field structure with the dissipative region only near the equatorial current sheet outside the light cylinder. We use the test-particle trajectory method to compute the energy-dependent γ-ray light curves and phase-average and phase-resolved sp

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Bakota, Mario, Igor Jelaska, Serdjo Kos, and David Brčić. "Statistical Approach to Research on the Relationship Between Kp/Dst Geomagnetic Indices and Total GPS Position Error." Remote Sensing 17, no. 14 (2025): 2374. https://doi.org/10.3390/rs17142374.

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This study examines the impact of geomagnetic disturbances quantified by the Kp and Dst indices on the accuracy of single-frequency GPS positioning across mid-latitudes and the equatorial zone, with a focus on temporal and spatial positioning errors variability. GNSS data from a globally distributed network of 14 IGS stations were analyzed for September 2017, featuring significant geomagnetic activity. The selection of stations encompassed equatorial and mid-latitude regions (approximately ±45°), strategically aligned with the distribution of the Dst index during geomagnetic storms. Satellite

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Eren, Saliha, and Jean-Pierre Rozelot. "Exploring the Temporal Variation of the Solar Quadrupole Moment J ₂." Astrophysical Journal 942, no. 2 (2023): 90. http://dx.doi.org/10.3847/1538-4357/aca8a4.

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Abstract Recently, Rozelot & Eren pointed out that the first solar gravitational moment (J 2) might exhibit a temporal variation. The suggested explanation is through the temporal variation of the solar rotation with latitude. This issue is deeper developed due to an accurate knowledge of the long-term variations in solar differential rotation regarding solar activity. Here we analyze solar cycles 12–24, investigating the long-term temporal variations in solar differential rotation. It is shown that J 2 exhibits a net modulation over the 13 studied cycles of ≈(89.6 ± 0.1) yr, with a peak-t

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Bregadze, V., A. Efremov, and V. Sharutin. "Synthesis and crystal structure of tris(3-fluorophenyl)antimony bis(2-methylcarboranylcarboxylate)." Bulletin of the South Ural State University series "Chemistry" 15, no. 1 (2023): 43–49. http://dx.doi.org/10.14529/chem230104.

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Oxidation of tris(3-fluorophenyl)antimony with hydrogen hydroperoxide in the presence of 2-methylcarboranylcarboxylic acid leads to the formation of tris(3-fluorophenyl)antimony bis(2-methylcarboranylcarboxylate) (1), the structural features of which have been established by X-ray diffraction analysis. According to X-ray diffraction analysis performed at 293 K on an automatic four-circle diffractometer D8 Quest Bruker (two-coordinate CCD detector, Mo Kα-radiation, λ = 0.71073 Å, graphite monochromator), the crystals are characterized by: C26H38B20F3O4Sb, M 809.52; monoclinic system, space grou

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Blagoveshchenskaya, Elena, Evgenia Lyskova, and Konstantin Sannikov. "Variations of seismic activity caused by the Chandler Wobble." E3S Web of Conferences 127 (2019): 03007. http://dx.doi.org/10.1051/e3sconf/201912703007.

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The problem of the correlation of the global dynamic phenomenon “Chandler wobble” with the local dynamics in different parts of the Earth’s crust and lithosphere is wide of the solution. In this study, an attempt was made to approach the solution by analyzing the temporal variations of local seismic activity in the restricted geospace volumes (GSV) within the uniform seismoactive regions. The driver of Chandler wobble is the deep mantle – the most hard and most massive Earth’s layer, whose large inertia tensor value is able to keep up Chandler’s specific rotation of the Earth for a long time.

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Liu, Yanyun, Lian Xie, John M. Morrison, and Daniel Kamykowski. "Dynamic Downscaling of the Impact of Climate Change on the Ocean Circulation in the Galápagos Archipelago." Advances in Meteorology 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/837432.

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The regional impact of global climate change on the ocean circulation around the Galápagos Archipelago is studied using the Hybrid Coordinate Ocean Model (HYCOM) configured for a four-level nested domain system. The modeling system is validated and calibrated using daily atmospheric forcing derived from the NCEP/NCAR reanalysis dataset from 1951 to 2007. The potential impact of future anthropogenic global warming (AGW) in the Galápagos region is examined using the calibrated HYCOM with forcing derived from the IPCC-AR4 climate model. Results show that although the oceanic variability in the en

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Pereira, Janini, Mariela Gabioux, Martinho Marta Almeida, Mauro Cirano, Afonso M. Paiva, and Alessandro L. Aguiar. "THE BIFURCATION OF THE WESTERN BOUNDARY CURRENT SYSTEM OF THE SOUTH ATLANTIC OCEAN." Revista Brasileira de Geofísica 32, no. 2 (2014): 241. http://dx.doi.org/10.22564/rbgf.v32i2.456.

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ABSTRACT. The results of two high-resolution ocean global circulation models – OGCMs (Hybrid Coordinate Ocean Model – HYCOM and Ocean Circulation andClimate Advanced Modeling Project – OCCAM) are analyzed with a focus on the Western Boundary Current (WBC) system of the South Atlantic Ocean. The volumetransports are calculated for different isopycnal ranges, which represent the most important water masses present in this region. The latitude of bifurcation of the zonalflows reaching the coast, which leads to the formation of southward or northward WBC flow at different depths (or isopycnal leve

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Schäfer, S., K. H. Glassmeier, P. T. I. Eriksson, et al. "Spatio-temporal structure of a poloidal Alfvén wave detected by Cluster adjacent to the dayside plasmapause." Annales Geophysicae 26, no. 7 (2008): 1805–17. http://dx.doi.org/10.5194/angeo-26-1805-2008.

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Abstract. A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscillates with a frequency of f=23 mHz. Investigating the wave energy flux reveals the standing wave nature of the observed pulsation. An estimation of the azimuthal wave number exposes a narrow azimuthal structure of the wave field with m≈160. Spatial and temporal characteristics of the pulsation are analyzed in detail by representing data in a f

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Zhang, Yiran, Siming Liu, and Houdun Zeng. "A three-component model for cosmic ray spectrum and dipole anisotropy." Monthly Notices of the Royal Astronomical Society 511, no. 4 (2022): 6218–24. http://dx.doi.org/10.1093/mnras/stac470.

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ABSTRACT Using a three-component, multiscale diffusion model, we show that the cosmic ray (CR) proton and helium spectra and the dipole anisotropy can be explained with reasonable parameters. The model includes a nearby source associated with the supernova remnant (SNR) that gave rise to the Geminga pulsar, a source at the Galactic Centre, and a component associated with the Galactic disc. The CR flux below TeV is dominated by the disc component. The centre source with a continuous injection of CRs starting about 18 Myr ago is needed to explain the anisotropy above 100 TeV. With the assumption

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BAUROV, YU A., A. A. KONRADOV, V. F. KUSHNIRUK та ін. "EXPERIMENTAL INVESTIGATIONS OF CHANGES IN β-DECAY RATE OF 60Co AND 137Cs". Modern Physics Letters A 16, № 32 (2001): 2089–101. http://dx.doi.org/10.1142/s0217732301005187.

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Results of simultaneous measurements of β-decay rate with the aid of Ge(Li)-detectors performed at two laboratories 140 km apart (INR RAS, Troitsk, 60 Co , and JINR, Dubna, 137 Cs ) from 15 March 2000 to 10 April 2000 are presented. Regular deviations of the count rate of γ-quanta following the β-decay of ~0.7% (INR RAS, 60 Co ) and ~0.2% (JINR, 137 Cs ) from the statistical average, are observed. The analysis of extremum deviations of γ--quanta count rate shows that the set of directions of tangents to the Earth's parallels of latitude at the extremum points of trajectories of motion in the s

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Johnson, R. S. "Application of the ideas and techniques of classical fluid mechanics to some problems in physical oceanography." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2111 (2017): 20170092. http://dx.doi.org/10.1098/rsta.2017.0092.

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This review makes a case for describing many of the flows observed in our oceans, simply based on the Euler equation, with (piecewise) constant density and with suitable boundary conditions. The analyses start from the Euler and mass conservation equations, expressed in a rotating, spherical coordinate system (but the f -plane and β -plane approximations are also mentioned); five examples are discussed. For three of them, a suitable non-dimensionalization is introduced, and a single small parameter is identified in each case. These three examples lead straightforwardly and directly to new resu

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Shutts, G. J. "Planetary semi-geostrophic equations derived from Hamilton's principle." Journal of Fluid Mechanics 208 (November 1989): 545–73. http://dx.doi.org/10.1017/s0022112089002934.

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A new set of balanced equations (to be called planetary semi-geostrophic equations) for planetary-scale flow is derived from Hamilton's principle and constitutes a natural generalization of the semi-geostrophic equations of motion. Analogues of the global conservation of energy and the Lagrangian conservation of potential vorticity follow automatically by introducing approximations directly into the Hamiltonian in such a way that time and particle label symmetries are preserved. Two approximations are required: first, the kinetic energy associated with the component of velocity parallel to the

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Runov, A., V. A. Sergeev, R. Nakamura, et al. "Local structure of the magnetotail current sheet: 2001 Cluster observations." Annales Geophysicae 24, no. 1 (2006): 247–62. http://dx.doi.org/10.5194/angeo-24-247-2006.

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Abstract. Thirty rapid crossings of the magnetotail current sheet by the Cluster spacecraft during July-October 2001 at a geocentric distance of 19 RE are examined in detail to address the structure of the current sheet. We use four-point magnetic field measurements to estimate electric current density; the current sheet spatial scale is estimated by integration of the translation velocity calculated from the magnetic field temporal and spatial derivatives. The local normal-related coordinate system for each case is defined by the combining Minimum Variance Analysis (MVA) and the curlometer te

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Murphree, J. S., L. L. Cogger, R. D. Elphinstone, and D. Hearn. "The response of the quiet-time auroral configuration to short- and long-term interplanetary magnetic field variations." Canadian Journal of Physics 69, no. 8-9 (1991): 1040–46. http://dx.doi.org/10.1139/p91-161.

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Observations from the IMP-8 satellite of the interplanetary magnetic field (IMF) are compared with areas of the polar region bounded by the aurora as observed by the Viking spacecraft during quiet-time conditions (IMF Bz northward). A variety of energy-coupling functions are investigated and it is determined that the auroral distribution can be best described by the inclusion of azimuthal terms in addition to standard energy-coupling functions. The auroral distributions for Bz northward support antiparallel merging as a mechanism whereby energy is transferred to the magnetosphere from the sola

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Nakamura, Noboru, and Abraham Solomon. "Finite-Amplitude Wave Activity and Mean Flow Adjustments in the Atmospheric General Circulation. Part II: Analysis in the Isentropic Coordinate." Journal of the Atmospheric Sciences 68, no. 11 (2011): 2783–99. http://dx.doi.org/10.1175/2011jas3685.1.

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Abstract The finite-amplitude wave activity diagnostic developed for quasigeostrophic (QG) flows in Part I is extended to the global primitive equation system in the isentropic coordinate. The Rossby wave activity density A is proportional to Kelvin’s circulation around the wavy potential vorticity (PV) contour minus that around the zonal circle that encloses the same isentropic mass. A quasi-conservative, eddy-free reference state flow uREF is constructed from the observed Kelvin’s circulation by zonalizing the PV contours conservatively while enforcing gradient balance. The departure of the

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