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Journal articles on the topic 'Champ gravitationnel'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Meftah, Mohammed Tayeb, and Mohamed Abdelwahab Bitour. "Un Modèle Quantique d’un Accélérateur de Fermi dans un Champ Gravitationnel." حوليات العلوم و التكنولوجيا 6, no. 1 (2014): 1–4. http://dx.doi.org/10.12816/0010619.

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2

Balakin, Alexander B., and Fedor G. Suslikov. "Modèle exactement intégrable d'évolution d'un système relativiste avec spin isotopique dans le champ du rayonnement gravitationnel." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 324, no. 10 (1997): 619–26. http://dx.doi.org/10.1016/s1251-8069(97)83181-8.

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3

IORIO, LORENZO. "PERSPECTIVES ON MEASURING THE PPN PARAMETERS β AND γ IN EARTH'S GRAVITATIONAL FIELD TO HIGH ACCURACY WITH CHAMP/GRACE MODELS". International Journal of Modern Physics D 17, № 05 (2008): 815–29. http://dx.doi.org/10.1142/s0218271808012516.

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The current bounds on the PPN parameters β and γ are on the order of 10-4–10-5. Many missions aimed at improving such limits by several orders of magnitude have been proposed, including LATOR, ASTROD, BepiColombo and GAIA. They involve the use of various spacecraft, to be launched along interplanetary trajectories, for measuring the post-Newtonian effects induced by solar gravity on the propagation of electromagnetic waves. In this paper, we investigate the requirements needed to measure the combination ν = (2 + 2γ - β)/3 entering the post-Newtonian Einstein pericenter precession [Formula: see

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4

Liu, Xiaogang, and Xiaoping Wu. "Construction of Earth's gravitational field model from CHAMP, GRACE and GOCE data." Geodesy and Geodynamics 6, no. 4 (2015): 292–98. http://dx.doi.org/10.1016/j.geog.2015.06.001.

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5

Deleflie, F., P. Exertier, P. Berio, et al. "A first analysis of the mean motion of CHAMP." Advances in Geosciences 1 (June 30, 2003): 95–101. http://dx.doi.org/10.5194/adgeo-1-95-2003.

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Abstract. The present study consists in studying the mean orbital motion of the CHAMP satellite, through a single long arc on a period of time of 200 days in 2001. We actually investigate the sensibility of its mean motion to its accelerometric data, as measures of the surface forces, over that period. In order to accurately determine the mean motion of CHAMP, we use “observed" mean orbital elements computed, by filtering, from 1-day GPS orbits. On the other hand, we use a semi-analytical model to compute the arc. It consists in numerically integrating the effects of the mean potentials (due t

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6

van den IJssel, Jose, and Pieter Visser. "Determination of non-gravitational accelerations from GPS satellite-to-satellite tracking of CHAMP." Advances in Space Research 36, no. 3 (2005): 418–23. http://dx.doi.org/10.1016/j.asr.2005.01.107.

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7

Kluykov, A. A., and S. N. Yashkin. "Computation of first and second order derivatives gravity potential in different coordinate systems." Geodesy and Cartography 925, no. 7 (2017): 15–22. http://dx.doi.org/10.22389/0016-7126-2017-926-8-15-22.

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The determination of parameters of the Earth’s gravitational field model by using the satellite gravity projects CHAMP, GRACE, GOCE is carried out on the basis of mathematical processing of measurement information of sensor systems installed on board of a spacecraft. Each of these sensor systems realizes its coordinate system, in which measurements are performed. Measured parameters, as a rule, are related to the coordinate system of the sensory system, and the required parameters refer to the Earth’s coordinate system (EFRF). Therefore, to determine the required parameters, it is necessary to

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8

Reubelt, T., G. Austen, and E. W. Grafarend. "Space Gravity Spectroscopy - determination of the Earth’s gravitational field by means of Newton interpolated LEO ephemeris Case studies on dynamic (CHAMP Rapid Science Orbit) and kinematic orbits." Advances in Geosciences 1 (July 11, 2003): 127–35. http://dx.doi.org/10.5194/adgeo-1-127-2003.

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Abstract. An algorithm for the (kinematic) orbit analysis of a Low Earth Orbiting (LEO) GPS tracked satellite to determine the spherical harmonic coefficients of the terrestrial gravitational field is presented. A contribution to existing long wavelength gravity field models is expected since the kinematic orbit of a LEO satellite can nowadays be determined with very high accuracy in the range of a few centimeters. To demonstrate the applicability of the proposed method, first results from the analysis of real CHAMP Rapid Science (dynamic) Orbits (RSO) and kinematic orbits are illustrated. In

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9

Eshagh, M., M. Abdollahzadeh, and M. Najafi-Alamdari. "Simplification of Geopotential Perturbing Force Acting on A Satellite." Artificial Satellites 43, no. 2 (2008): 45–64. http://dx.doi.org/10.2478/v10018-009-0006-7.

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Simplification of Geopotential Perturbing Force Acting on A SatelliteOne of the aspects of geopotential models is orbit integration of satellites. The geopotential acceleration has the largest influence on a satellite with respect to the other perturbing forces. The equation of motion of satellites is a second-order vector differential equation. These equations are further simplified and developed in this study based on the geopotential force. This new expression is much simpler than the traditional one as it does not derivatives of the associated Legendre functions and the transformations are

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10

Lühr, H., T. A. Siddiqui, and S. Maus. "Global characteristics of the lunar tidal modulation of the equatorial electrojet derived from CHAMP observations." Annales Geophysicae 30, no. 3 (2012): 527–36. http://dx.doi.org/10.5194/angeo-30-527-2012.

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Abstract. It has been known since many decades that lunar tide has an influence on the strength of the equatorial electrojet (EEJ). There has, however, never been a comprehensive study of the tidal effect on a global scale. Based on the continuous magnetic field measurements by the CHAMP satellite over 10 years it is possible to investigate the various aspects of lunar effects on the EEJ. The EEJ intensity is enhanced around times when the moon is overhead or at the antipode. This effect is particularly strong around noon, shortly after new and full moon. The lunar tide manifests itself as a s

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11

Ince, E. Sinem, Franz Barthelmes, Sven Reißland, et al. "ICGEM – 15 years of successful collection and distribution of global gravitational models, associated services, and future plans." Earth System Science Data 11, no. 2 (2019): 647–74. http://dx.doi.org/10.5194/essd-11-647-2019.

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Abstract. The International Centre for Global Earth Models (ICGEM, http://icgem.gfz-potsdam.de/, last access: 6 May 2019) hosted at the GFZ German Research Centre for Geosciences (GFZ) is one of the five services coordinated by the International Gravity Field Service (IGFS) of the International Association of Geodesy (IAG). The goal of the ICGEM service is to provide the scientific community with a state-of-the-art archive of static and temporal global gravity field models of the Earth, and develop and operate interactive calculation and visualization services of gravity field functionals on u

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12

Reubelt, T., G. Austen, and E. W. Grafarend. "Harmonic analysis of the Earth's gravitational field by means of semi-continuous ephemerides of a low Earth orbiting GPS-tracked satellite. Case study: CHAMP." Journal of Geodesy 77, no. 5-6 (2003): 257–78. http://dx.doi.org/10.1007/s00190-003-0322-9.

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13

Ruan, Cheng-Zong, Tong-Jie Zhang, and Bin Hu. "Non-linear matter power spectrum without screening dynamics modelling in f(R) gravity." Monthly Notices of the Royal Astronomical Society 492, no. 3 (2020): 4235–45. http://dx.doi.org/10.1093/mnras/staa006.

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ABSTRACT Halo model is a physically intuitive method for modelling the non-linear power spectrum, especially for the alternatives to the standard ΛCDM models. In this paper, we examine the Sheth–Tormen barrier formula adopted in the previous CHAM method. As an example, we model the ellipsoidal collapse of top-hat dark matter haloes in f(R) gravity. A good agreement between Sheth–Tormen formula and our result is achieved. The relative difference in the ellipsoidal collapse barrier is less than or equal to $1.6{{\ \rm per\ cent}}$. Furthermore, we verify that, for F4 and F5 cases of Hu–Sawicki f

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14

Han, S. C., C. Jekeli, and C. K. Shum. "Static and temporal gravity field recovery using grace potential difference observables." Advances in Geosciences 1 (June 17, 2003): 19–26. http://dx.doi.org/10.5194/adgeo-1-19-2003.

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Abstract. The gravity field dedicated satellite missions like CHAMP, GRACE, and GOCE are supposed to map the Earth’s global gravity field with unprecedented accuracy and resolution. New models of Earth’s static and time-variable gravity field will be available every month as one of the science products from GRACE. Here we present an alternative method to estimate the gravity field efficiently using the in situ satellite-to-satellite observations at the altitude and show results on static as well as temporal gravity field recovery. Considering the energy relation between the kinetic energy of t

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15

Teixeira da Encarnação, João, Pieter Visser, Daniel Arnold, et al. "Description of the multi-approach gravity field models from Swarm GPS data." Earth System Science Data 12, no. 2 (2020): 1385–417. http://dx.doi.org/10.5194/essd-12-1385-2020.

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Abstract. Although the knowledge of the gravity of the Earth has improved considerably with CHAMP, GRACE, and GOCE (see appendices for a list of abbreviations) satellite missions, the geophysical community has identified the need for the continued monitoring of the time-variable component with the purpose of estimating the hydrological and glaciological yearly cycles and long-term trends. Currently, the GRACE-FO satellites are the sole dedicated provider of these data, while previously the GRACE mission fulfilled that role for 15 years. There is a data gap spanning from July 2017 to May 2018 b

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16

Moore, P. "Annual and semiannual variations of the Earth's gravitational field from satellite laser ranging and CHAMP." Journal of Geophysical Research 110, B6 (2005). http://dx.doi.org/10.1029/2004jb003448.

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