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Journal articles on the topic 'Low latitude current system'

Author: Grafiati

Published: 6 September 2023

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1

Grafe, A., P. A. Bespalov, V. Y. Trakhtengerts, and A. G. Demekhov. "Afternoon mid-latitude current system and low-latitude geomagnetic field asymmetry during geomagnetic storms." Annales Geophysicae 15, no. 12 (1997): 1537–47. http://dx.doi.org/10.1007/s00585-997-1537-5.

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Abstract. For four geomagnetic storms of middle intensity the relationship between the low-latitude magnetic field asymmetry using ASY indices and the intensity of the auroral eastward and westward electrojet was considered. It was asked whether there exists a connection between ASY and the eastward electrojet. To answer this question equivalent current systems were estimated in mid-latitudes. It was found that the observations obviously show no correlative relationship between the low-latitude magnetic-field asymmetry and the eastward electrojet, whereas one exists between ASY and the westwar

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2

Liu, Ping, Chun Ming Liu, and Lian Guang Liu. "Variation Characteristics of Geoelectric Field in Mid-to-Low Latitude Area during Geomagnetic Storms." Advanced Materials Research 1008-1009 (August 2014): 524–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.524.

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Large geoelectric field generated in the ground during severe space weather events are sources of geomagnetically induced currents (GICs), which flow in power systems potentially causing damage to system component or failure of the system. In this paper, based on the H and D components of the recent geomagnetic storm data measured at 10 mid-to-low latitude geomagnetic observatories, we analyzed the variation characteristics of the amplitude of north-south and east-west geoelectric components with geographic latitudes. Furthermore, we discussed the possibilities of GIC problem occurrence in tra

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3

Siscoe, G. L., W. Lotko, and B. U. Ö. Sonnerup. "A high-latitude, low-latitude boundary layer model of the convection current system." Journal of Geophysical Research 96, A3 (1991): 3487. http://dx.doi.org/10.1029/90ja02362.

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4

Tinsley, B. A., R. Rohrbaugh, H. Rassoul, Y. Sahai, N. R. Teixeira, and D. Slater. "Low-latitude aurorae and storm time current systems." Journal of Geophysical Research 91, A10 (1986): 11257. http://dx.doi.org/10.1029/ja091ia10p11257.

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5

Saka, O., J. S. Kim, and D. J. Knecht. "Ionospheric equivalent current systems of low-latitude Pc3 pulsations." Planetary and Space Science 36, no. 7 (1988): 641–53. http://dx.doi.org/10.1016/0032-0633(88)90112-2.

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6

Yamauchi, Masatoshi, Magnar G. Johnsen, Carl-Fredrik Enell, Anders Tjulin, Anna Willer, and Dmitry A. Sormakov. "High-latitude crochet: solar-flare-induced magnetic disturbance independent from low-latitude crochet." Annales Geophysicae 38, no. 6 (2020): 1159–70. http://dx.doi.org/10.5194/angeo-38-1159-2020.

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Abstract. A solar-flare-induced, high-latitude (peak at 70–75∘ geographic latitude – GGlat) ionospheric current system was studied. Right after the X9.3 flare on 6 September 2017, magnetic stations at 68–77∘ GGlat near local noon detected northward geomagnetic deviations (ΔB) for more than 3 h, with peak amplitudes of >200 nT without any accompanying substorm activities. From its location, this solar flare effect, or crochet, is different from previously studied ones, namely, the subsolar crochet (seen at lower latitudes), auroral crochet (pre-requires auroral electrojet in sunlight), or cu

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7

Belenkaya, E. S., I. I. Alexeev, and C. R. Clauer. "Magnetic field of the transition current system: dawn-dusk asymmetry." Annales Geophysicae 25, no. 8 (2007): 1899–911. http://dx.doi.org/10.5194/angeo-25-1899-2007.

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Abstract. In this paper we consider the interactions of coronal mass ejections (CMEs) with the Earth's magnetosphere for the specific case in which there is a sharp increase in the dynamic pressure (interplanetary shock) that is associated with a simultaneous northward turning of the interplanetary magnetic field (IMF) from the near horizontal direction. Previously, we have shown that under such circumstances, the so-called transition current systems arise. These temporary high-latitude current systems create a low-latitude asymmetric magnetic field on the ground with a large northward field e

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8

Liu, Zhiyu, Qiang Lian, Fangtao Zhang, et al. "Weak Thermocline Mixing in the North Pacific Low-Latitude Western Boundary Current System." Geophysical Research Letters 44, no. 20 (2017): 10,530–10,539. http://dx.doi.org/10.1002/2017gl075210.

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Caley, T., J. H. Kim, B. Malaizé, et al. "High-latitude obliquity as a dominant forcing in the Agulhas current system." Climate of the Past 7, no. 4 (2011): 1285–96. http://dx.doi.org/10.5194/cp-7-1285-2011.

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Abstract. The Agulhas Current transport of heat and salt from the Indian Ocean into the South Atlantic around South Africa (Agulhas leakage), can affect the Atlantic meridional overturning circulation (AMOC) and, thus, influence global climate. However, efforts to elucidate forcing mechanisms connecting the Agulhas leakage with the upstream dynamics of the current have been hampered by a lack of climate records extracted from the area where the Agulhas current originates. We determine 800-kyr sea surface temperature (SST) and salinity (SSS) records from the "precursor" region of the Agulhas cu

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10

Sunoj Valiaparambil Sebastian, John, Xuejun Dong, Calvin Trostle, et al. "Hemp Agronomy: Current Advances, Questions, Challenges, and Opportunities." Agronomy 13, no. 2 (2023): 475. http://dx.doi.org/10.3390/agronomy13020475.

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Hemp (Cannabis sativa L. ssp. sativa) has a long history of domestication due to its versatile use. Recently, different sectors in the economy are investigating hemp cultivation to increase agronomic production and to limit delta-9-tetrahydrocannabinol (THC). Despite the rapid growth of hemp literature in recent years, it is still uncertain whether the knowledge gained from higher latitude regions is applicable to low latitude and tropical regions where hemp has not been grown traditionally. This review provides a comprehensive and updated survey of hemp agronomy, focusing on environmental and

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11

Qiu, Bo, Shuiming Chen, Daniel L. Rudnick, and Yuji Kashino. "A New Paradigm for the North Pacific Subthermocline Low-Latitude Western Boundary Current System." Journal of Physical Oceanography 45, no. 9 (2015): 2407–23. http://dx.doi.org/10.1175/jpo-d-15-0035.1.

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AbstractSubthermocline western boundary circulation along the low-latitude North Pacific Ocean (2°–25°N) is investigated by using profiling float and historical CTD/expendable CTD (XCTD) data and by analyzing an eddy-resolving global OGCM output. In contrast to the existing paradigm depicting it as a reversed pattern of the wind-driven circulation above the ventilated thermocline (i.e., depth < 26.8 σθ), the subthermocline western boundary circulation is found to comprise two components governed by distinct dynamical processes. For meridional scales shorter than 400 km, the boundary flows a

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12

Zawawi, Anis Adiba, Nur Fadilah Ab Aziz, Mohd Zainal Abidin Ab Kadir, Halimatun Hashim, and Zmnako Mohammed. "Evaluation of Geomagnetic Induced Current on 275 kV Power Transformer for a Reliable and Sustainable Power System Operation in Malaysia." Sustainability 12, no. 21 (2020): 9225. http://dx.doi.org/10.3390/su12219225.

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Geomagnetic induced current (GIC) occurs as a direct consequence of abnormal space weather which starts from the sun and may flow into a power system network through neutral grounding connections. The flow of GIC through grounded neutral power transformer has been a major concern to researchers since it can potentially affect power system equipment. Most of the previous research was focused on high and mid latitude countries only. However, it has been proven that the GIC is not only limited to high and mid latitudes, but also extends to power systems at lower geographic latitudes. This paper a

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13

Krauklis, I., and D. Orr. "The effects of ionospheric 'phase mixing' on a distributed driven shear Alfvén ulf pulsation'." Annales Geophysicae 12, no. 2/3 (1994): 188–94. http://dx.doi.org/10.5194/angeo-12-188-1994.

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Abstract. A numerical simulation study of the ultra-low frequency (ULF) H-component magnetic field at the Earth's surface arising from a perturbation ionospheric Hall current has been developed. The Hall current system is driven by field-aligned currents (FACs) associated with shear Alfvén field line resonances (FLRs) driven by fast mode global cavity oscillations. The ionospheric phase mixing of the Hall current manifests itself in a number of ways in the ground field, these are: (i) Smoothing the spectral maxima of the ground signal: (ii) Loss in clarity of the harmonic structure of the spec

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14

Liu, Jann-Yenq, Chien-Hung Lin, Panthalingal Krishnanunni Rajesh, et al. "Advances in Ionospheric Space Weather by Using FORMOSAT-7/COSMIC-2 GNSS Radio Occultations." Atmosphere 13, no. 6 (2022): 858. http://dx.doi.org/10.3390/atmos13060858.

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This paper provides an overview of the contributions of the space-based global navigation satellite system (GNSS) radio occultation (RO) measurements from the FORMOSAT-7/COSMIC2 (F7/C2) mission in advancing our understanding of ionospheric plasma physics in the purview of space weather. The global positioning system (GPS) occultation experiment (GOX) onboard FORMOSAT-3/COSMIC (F3/C), with more than four and half million ionospheric RO soundings during April 2006–May 2020, offered a unique three-dimensional (3D) perspective to examine the global electron density distribution and unravel the und

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15

Lovati, Giulia, Paola De Michelis, Giuseppe Consolini, and Francesco Berrilli. "Pressure-Gradient Current at High Latitude from Swarm Measurements." Remote Sensing 14, no. 6 (2022): 1428. http://dx.doi.org/10.3390/rs14061428.

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The pressure-gradient current is among the weaker ionospheric current systems arising from plasma pressure variations. It is also called diamagnetic current because it produces a magnetic field which is oriented oppositely to the ambient magnetic field, causing its reduction. The magnetic reduction can be revealed in measurements made by low-Earth orbiting satellites flying close to ionospheric plasma regions where rapid changes in density occur. Using geomagnetic field, plasma density and electron temperature measurements recorded on board ESA Swarm A satellite from April 2014 to March 2018,

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16

Talari, Prashanthi, and Sampad Kumar Panda. "Occurrences of counter electrojets and possible ionospheric TEC variations round new Moon and full Moon days across the low latitude Indian region." Journal of Applied Geodesy 13, no. 3 (2019): 245–55. http://dx.doi.org/10.1515/jag-2019-0014.

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Abstract The present paper investigates the alterations in ionospheric Total Electron Content (TEC) over a low latitude location Bangalore (Geographic latitude {12.9^{\circ }}\hspace{2.38387pt}\text{N} and longitude {77.6^{\circ }}\hspace{2.38387pt}\text{E}; Geomagnetic latitude 4.{5^{\circ }}\hspace{2.38387pt}\text{N}) in India, corresponding to the new Moon and full Moon days which are associated with abnormality in the eastward Equatorial Electrojet (EEJ) currents. It has been well established that even during certain geomagnetic quiet days, the EEJ current direction is reversed, resulting

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17

Barkhatov, N. A., S. E. Revunov, O. T. Cherney, M. V. Mukhina, and Zh V. Smirnova. "Neural networks technique for detecting current systems while main phase of geomagnetic storm." E3S Web of Conferences 220 (2020): 01091. http://dx.doi.org/10.1051/e3sconf/202022001091.

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The study demonstrated the technology for searching nonlinear correlations between the intensity indices of auroral electric jets (AU, AL) and ring current intensity indices (SYM, ASY). The well-known connection of the western electrojet with the asymmetric part of the ring current and the eastern electrodett with the symmetric is confirmed. The technology of artificial neural networks was chosen as the main method. Thus, the relationship of magnetic disturbances in the auroral region and magnetic disturbances at middle and low latitudes in the main phase of a geomagnetic storm is investigated

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18

Alberti, Tommaso, Davide Faranda, Giuseppe Consolini, Paola De Michelis, Reik V. Donner, and Vincenzo Carbone. "Concurrent Effects between Geomagnetic Storms and Magnetospheric Substorms." Universe 8, no. 4 (2022): 226. http://dx.doi.org/10.3390/universe8040226.

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An accurate understanding of dissimilarities in geomagnetic variability between quiet and disturbed periods has the potential to vastly improve space weather diagnosis. In this work, we exploit some recently developed methods of dynamical system theory to provide new insights and conceptual ideas in space weather science. In particular, we study the co-variation and recurrence statistics of two geomagnetic indices, SYM-H and AL, that measure the intensity of the globally symmetric component of the equatorial electrojet and that of the westward auroral electrojet, respectively. We find that the

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19

Montañez, Isabel Patricia. "Current synthesis of the penultimate icehouse and its imprint on the Upper Devonian through Permian stratigraphic record." Geological Society, London, Special Publications 512, no. 1 (2021): 213–45. http://dx.doi.org/10.1144/sp512-2021-124.

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AbstractIcehouses are the less common climate state on Earth, and thus it is notable that the longest-lived (c.370 to 260 Ma) and possibly most extensive and intense of icehouse periods spanned the Carboniferous Period. Mid- to high-latitude glaciogenic deposits reveal a dynamic glaciation–deglaciation history with ice waxing and waning from multiple ice centres and possible transcontinental ice sheets during the apex of glaciation. New high-precision U–Pb ages confirm a hypothesized west-to-east progression of glaciation through the icehouse, but reveal that its demise occurred as a series of

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20

Wen, Xixi, and Wansuo Duan. "Errors in Current Velocity in the Low-latitude North Pacific: Results from the Regional Ocean Modeling System." Advances in Atmospheric Sciences 36, no. 4 (2019): 397–416. http://dx.doi.org/10.1007/s00376-018-8140-4.

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21

Pyatibrat, E. D. "Justification of the effectiveness of organized summer recreation under different climatic and geographical conditions for normalizing the organism functional state in veterans of extreme activities." Medicо-Biological and Socio-Psychological Problems of Safety in Emergency Situations, no. 4 (February 10, 2019): 34–39. http://dx.doi.org/10.25016/2541-7487-2018-0-4-34-39.

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Relevance. Participation in military conflicts, long-term vital threat, irregular working hours, frequent moving to new places of residence impose negative imprints in the form of various functional disorders and even the formation of psychogenic diseases on employees of various law enforcement agencies.Intention. To assess the impact of organized summer holidays under different climatic conditions on the functional state of the veterans of law enforcement agencies previously engaged in activities under extreme conditions.Methodology. 65 retired men soldiers of different law enforcement agenci

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22

Spall, Michael A., and David Nieves. "Wind-Forced Variability of the Remote Meridional Overturning Circulation." Journal of Physical Oceanography 50, no. 2 (2020): 455–69. http://dx.doi.org/10.1175/jpo-d-19-0190.1.

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AbstractThe mechanisms by which time-dependent wind stress anomalies at midlatitudes can force variability in the meridional overturning circulation at low latitudes are explored. It is shown that winds are effective at forcing remote variability in the overturning circulation when forcing periods are near the midlatitude baroclinic Rossby wave basin-crossing time. Remote overturning is required by an imbalance in the midlatitude mass storage and release resulting from the dependence of the Rossby wave phase speed on latitude. A heuristic theory is developed that predicts the strength and freq

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23

Wang, H., H. Lühr, S. Y. Ma, and P. Ritter. "Statistical study of the substorm onset: its dependence on solar wind parameters and solar illumination." Annales Geophysicae 23, no. 6 (2005): 2069–79. http://dx.doi.org/10.5194/angeo-23-2069-2005.

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Abstract. Based on 1829 well-defined substorm onsets in the Northern Hemisphere, observed during a 2-year period by the FUV Imager on board the IMAGE spacecraft, a statistical study is performed. From the combination of solar wind parameter observations by ACE and magnetic field observations by the low altitude satellite CHAMP, the location of auroral breakups in response to solar illumination and solar coupling parameters are studied. Furthermore, the correspondence of the onset location with prominent large-scale field-aligned currents and electrojets are investigated. Solar illumination and

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24

Lopez, R. E., V. G. Merkin, and J. G. Lyon. "The role of the bow shock in solar wind-magnetosphere coupling." Annales Geophysicae 29, no. 6 (2011): 1129–35. http://dx.doi.org/10.5194/angeo-29-1129-2011.

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Abstract. In this paper we examine the role of the bow shock in coupling solar wind energy to the magnetosphere using global magnetohydrodynamic simulations of the solar wind-magnetosphere interaction with southward IMF. During typical solar wind conditions, there are two significant dynamo currents in the magnetospheric system, one in the high-latitude mantle region tailward of the cusp and the other in the bow shock. As the magnitude of the (southward) IMF increases and the solar wind becomes a low Mach number flow, there is a significant change in solar wind-magnetosphere coupling. The high

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25

Yang, Fan, Lian Guang Liu, Qi Li, and Dong Mei Yang. "Comparison Study of the Geomagnetically Induced Current Level of Power Grid in Different Latitude." Advanced Materials Research 463-464 (February 2012): 305–9. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.305.

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Geomagnetically induced current (GIC) relates to factors such as magnetic amplitude, geotecture and structure of power grid. On the basis of geotecture, according to the geomagnetic storm data of Dec 2006, employing the plan wave method, this paper finish the calculation of GIC level of 2012 Beijing planning power gird, and compare the result to the measure data of Shanghe substation, in Yanghuai transmission system. The comparison shows that power grid is much more affected by geotecture, direction and length of transmission line, grid topology and electrical parameters in mid-low latitude ar

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26

Grafe, A. "Are our ideas about <i>Dst</i> correct?" Annales Geophysicae 17, no. 1 (1999): 1–10. http://dx.doi.org/10.1007/s00585-999-0001-0.

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Abstract. The idea of two separate storm time ring currents, a symmetric and an asymmetric one has accepted since the 1960s. The existence of a symmetric equatorial ring current was concluded from Dst. However, the asymmetric development of the low-latitude geomagnetic disturbance field during storms lead to the assumption of the real existence of an asymmetric ring current. I think it is time to inquire whether this conception is correct. Thus, I have investigated the development of the low-latitude geomagnetic field during all the magnetic local times under disturbed and quiet conditions. Th

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27

Wang, Tianyu, Yan Du, and Minyang Wang. "Overlooked Current Estimation Biases Arising from the Lagrangian Argo Trajectory Derivation Method." Journal of Physical Oceanography 52, no. 1 (2022): 3–19. http://dx.doi.org/10.1175/jpo-d-20-0287.1.

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Abstract An Argo simulation system is used to provide synthetic Lagrangian trajectories based on the Estimating the Circulation and Climate of the Ocean Model, phase II (ECCO2). In combination with ambient Eulerian velocity at the reference layer (1000 m) from the model, quantitative metrics of the Lagrangian trajectory–derived velocities are computed. The result indicates that the biases induced by the derivation algorithm are strongly linked with ocean dynamics. In low latitudes, Ekman currents and vertically sheared geostrophic currents influence both the magnitude and the direction of the

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28

Clilverd, Mark A., Craig J. Rodger, Sarah Dietrich, et al. "High-latitude geomagnetically induced current events observed on very low frequency radio wave receiver systems." Radio Science 45, no. 2 (2010): n/a. http://dx.doi.org/10.1029/2009rs004215.

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29

Yang, Lucy, Nyree Zerega, Anastasia Montgomery, and Daniel E. Horton. "Potential of breadfruit cultivation to contribute to climate-resilient low latitude food systems." PLOS Climate 1, no. 8 (2022): e0000062. http://dx.doi.org/10.1371/journal.pclm.0000062.

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The number of people in food crisis around the world is increasing, exacerbated by COVID-19, conflict, and climate change. Major crop yields are projected to decrease in low-latitude regions, making tropical and sub-tropical food systems particularly vulnerable. Increased cultivation of breadfruit (Artocarpus altilis), a neglected and underutilized species (NUS), has the potential to enhance climate resilience and overall sustainability of low-latitude agricultural systems. To better understand breadfruit’s cultivation suitability and geographic range in current and future climates, we use bre

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30

Farah, Ashraf. "Single-Frequency Ionospheric-Delay Correction from BeiDou & GPS Systems for Northern Hemisphere." Artificial Satellites 54, no. 1 (2019): 1–15. http://dx.doi.org/10.2478/arsa-2019-0002.

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Abstract The range delay caused by the ionosphere layer is the major current source of error for GNSS users with single-frequency receivers. GNSS advice users to correct this type of error using ionospheric models whose coefficients are sent in their navigation messages. GPS-users use the Klobuchar model to correct this type of error. GPS navigation message contains the model’s eight coefficients which vary on the basis of seasonal ionospheric variations and average solar flux. The correction accuracy of Klobuchar model is about 50% (rms) of the ionospheric range delay. Beidou system calculate

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31

Rastogi, R. G., D. R. K. Rao, S. Alex, B. M. Pathan, and T. S. Sastry. "An intense SFE and SSC event in geomagnetic <i>H</i>, <i>Y</i> and <i>Z</i> fields at the Indian chain of observatories." Annales Geophysicae 15, no. 10 (1997): 1301–8. http://dx.doi.org/10.1007/s00585-997-1301-x.

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Abstract. Changes in the three components of geomagnetic field are reported at the chain of ten geomagnetic observatories in India during an intense solar crochet that occurred at 1311 h 75° EMT on 15 June 1991 and the subsequent sudden commencement (SSC) of geomagnetic storm at 1518 h on 17 June 1991. The solar flare effects (SFE) registered on the magnetograms appear to be an augmentation of the ionospheric current system existing at the start time of the flare. An equatorial enhancement in ΔH due to SFE is observed to be similar in nature to the latitudinal variation of SQ (H) at low latitu

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32

Nair, Deepukumar M., James Parisi, K. M. Nair, et al. "Introducing DuPont™ GreenTape™ 9K5 Low Dielectric Constant, Low Temperature Co-Fired Ceramic (LTCC) Tape System." International Symposium on Microelectronics 2011, no. 1 (2011): 000544–52. http://dx.doi.org/10.4071/isom-2011-wa3-paper4.

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Low Temperature Co-fired Ceramic (LTCC) material systems have been successfully used in microwave and millimeter wave systems for several years. LTCC has very low dielectric loss, high reliability due to inherent hermeticity; high interconnect density, multilayer processing capability leading to true 3D packaging, and better cost-performance balance. While the medium range dielectric constants (7.00 – 8.00) offered by current tape systems have advantages, it is generally difficult to realize high speed systems and efficient antennas on LTCC, especially at millimeter wave frequencies. The diffi

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Shaikhislamov, I. F., Yu P. Zakharov, V. G. Posukh, et al. "Region-1 field aligned currents in experiments on laser-produced plasma interacting with magnetic dipole." Proceedings of the International Astronomical Union 6, S274 (2010): 40–43. http://dx.doi.org/10.1017/s1743921311006545.

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AbstractIn previous experiments by the authors a generation of intense field aligned current (FAC) system on Terrella poles was observed. In the present report a question of these currents origin in a low latitude boundary layer of magnetosphere is investigated. Experimental evidence of such a link was obtained by measurements of magnetic field generated by tangential sheared drag. Results suggest that compressional and Alfven waves are responsible for FAC generation. The study is most relevant to FAC generation in the Earth and Hermean magnetospheres following pressure jumps in Solar Wind.

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Caley, T., J. H. Kim, B. Malaizé, et al. "High-latitude obliquity forcing drives the agulhas leakage." Climate of the Past Discussions 7, no. 3 (2011): 2193–215. http://dx.doi.org/10.5194/cpd-7-2193-2011.

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Abstract. The Agulhas Current (AC) transport of heat and salt from the Indian Ocean into the South Atlantic around South Africa (Agulhas leakage), has a profound role in the decadal variability of the Atlantic meridional overturning circulation (AMOC), which influences global climate. On glacial-interglacial timescales, paleostudies postulate that Agulhas leakage plays a decisive role for AMOC resumption during terminations (glacial-interglacial transitions). However, efforts to elucidate forcing mechanisms connecting Agulhas leakage with glacial-interglacial AMOC variability have been hampere

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35

Chen, Zan-ming, Chun-ming Liu, An-qi Li, and Yue Yan. "Modeling Calculation and Influencing Factors of Geomagnetically Induced Current in Sanhua Power Grid." Journal of Physics: Conference Series 2564, no. 1 (2023): 012034. http://dx.doi.org/10.1088/1742-6596/2564/1/012034.

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Abstract The time-varying magnetic field of a magnetic storm induces an electric field in the earth, which generates geomagnetically induced currents (GIC) when it acts on the power grid and has many hazards to the power system. In this paper, we model and calculate the ground-induced electric field and geomagnetically induced currents for 20 magnetic storms from 2008 to 2018, and investigate the effects of two factors, magnetic storm strength, and earth conductivity, on the geomagnetically induced currents, which are important for the prevention and control of GIC in large-scale power grids i

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Shin, V. I., M. S. Vorobyov, P. V. Moskvin, et al. "Latitude and amplitude modulation of the beam current for controlling its power during a submillisecond pulse." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 11 (2022): 176–84. http://dx.doi.org/10.17223/00213411/65/11/176.

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Methods for controlling the power electron beam in a source based on a low-pressure arc discharge with layer stabilization of the emission plasma boundary are described. The control is carried out by the method of amplitude and latitude modulation within the duration of the beam current pulse with a time resolution of 10 μs at a submillisecond pulse duration. Two ways to control the power of the electron beam are implemented: the first one is based on changing the concentration of the emission plasma by modulating the arc discharge current, the second method uses grid control (the mode of oper

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Kakad, Bharati, and Amar Kakad. "Characteristics of probability distribution functions of low- and high-latitude current systems during Solar Cycle 24." Advances in Space Research 65, no. 6 (2020): 1559–67. http://dx.doi.org/10.1016/j.asr.2019.12.021.

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Calabia, Andres, Chukwuma Anoruo, Munawar Shah, et al. "Low-Latitude Ionospheric Responses and Coupling to the February 2014 Multiphase Geomagnetic Storm from GNSS, Magnetometers, and Space Weather Data." Atmosphere 13, no. 4 (2022): 518. http://dx.doi.org/10.3390/atmos13040518.

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The ionospheric response and the associated mechanisms to geomagnetic storms are very complex, particularly during the February 2014 multiphase geomagnetic storm. In this paper, the low-latitude ionosphere responses and their coupling mechanisms, during the February 2014 multiphase geomagnetic storm, are investigated from ground-based magnetometers and global navigation satellite system (GNSS), and space weather data. The residual disturbances between the total electron content (TEC) of the International GNSS Service (IGS) global ionospheric maps (GIMs) and empirical models are used to investi

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Yeager, Stephen, and Gokhan Danabasoglu. "Sensitivity of Atlantic Meridional Overturning Circulation Variability to Parameterized Nordic Sea Overflows in CCSM4." Journal of Climate 25, no. 6 (2012): 2077–103. http://dx.doi.org/10.1175/jcli-d-11-00149.1.

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Abstract The inclusion of parameterized Nordic Sea overflows in the ocean component of the Community Climate System Model version 4 (CCSM4) results in a much improved representation of the North Atlantic tracer and velocity distributions compared to a control CCSM4 simulation without this parameterization. As a consequence, the variability of the Atlantic meridional overturning circulation (AMOC) on decadal and longer time scales is generally lower, but the reduction is not uniform in latitude, depth, or frequency–space. While there is dramatically less variance in the overall AMOC maximum (at

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Olatunbosun, LG, A. O. Olabode, and EA Ariyibi. "Variability of Equatorial Electrojet (EEJ) at EIA regions." Physics & Astronomy International Journal 6, no. 1 (2022): 1–4. http://dx.doi.org/10.15406/paij.2022.06.00241.

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The EEJ is a worldwide solar-driven wind that results in the solar quiet (Sq) current system in the E region of the earth’s ionosphere. The variability of some features such as EEJ, are very important in understanding the complex nature of the ionosphere, especially the low-latitude ionosphere. The magnetometer data from stations located near the equator and outside the edge of the electrojet strip for Africa and India stations were used to estimate and investigate the variability of EEJ in African and Indian Low-Latitudes. The stations are Addis Ababa, Ethiopia (geographic lat/long: 9.03oN/38

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Li, Ningbo, Lianwu Guan, Yanbin Gao, et al. "Indoor and Outdoor Low-Cost Seamless Integrated Navigation System Based on the Integration of INS/GNSS/LIDAR System." Remote Sensing 12, no. 19 (2020): 3271. http://dx.doi.org/10.3390/rs12193271.

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Global Navigation Satellite System (GNSS) provides accurate positioning data for vehicular navigation in open outdoor environment. In an indoor environment, Light Detection and Ranging (LIDAR) Simultaneous Localization and Mapping (SLAM) establishes a two-dimensional map and provides positioning data. However, LIDAR can only provide relative positioning data and it cannot directly provide the latitude and longitude of the current position. As a consequence, GNSS/Inertial Navigation System (INS) integrated navigation could be employed in outdoors, while the indoors part makes use of INS/LIDAR i

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Hanuise, C., J. C. Cerisier, F. Auchère, et al. "From the Sun to the Earth: impact of the 27-28 May 2003 solar events on the magnetosphere, ionosphere and thermosphere." Annales Geophysicae 24, no. 1 (2006): 129–51. http://dx.doi.org/10.5194/angeo-24-129-2006.

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Abstract. During the last week of May 2003, the solar active region AR 10365 produced a large number of flares, several of which were accompanied by Coronal Mass Ejections (CME). Specifically on 27 and 28 May three halo CMEs were observed which had a significant impact on geospace. On 29 May, upon their arrival at the L1 point, in front of the Earth's magnetosphere, two interplanetary shocks and two additional solar wind pressure pulses were recorded by the ACE spacecraft. The interplanetary magnetic field data showed the clear signature of a magnetic cloud passing ACE. In the wake of the succ

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Joo, Byoung-Soo, Jung-Wook Woo, Jeong-Hun Lee, et al. "Assessment of the Impact of Geomagnetic Disturbances on Korean Electric Power Systems." Energies 11, no. 7 (2018): 1920. http://dx.doi.org/10.3390/en11071920.

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Geomagnetic disturbances have the potential to impact the operation of electric power systems, and thus the assessment of their impacts is required as the first step for secure power system operations. While the effects of the disturbances have been observed primarily at higher latitudes, geomagnetic problems are also observed at mid and low latitude locations, in particular including neighboring countries to Korea such as China and Japan. This paper deals with the assessment of impact of geomagnetic disturbances on Korean electric power systems. For the assessment, the geoelectric fields indu

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Zhang, Rong, and Geoffrey K. Vallis. "Impact of Great Salinity Anomalies on the Low-Frequency Variability of the North Atlantic Climate." Journal of Climate 19, no. 3 (2006): 470–82. http://dx.doi.org/10.1175/jcli3623.1.

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Abstract In this paper, it is shown that coherent large-scale low-frequency variabilities in the North Atlantic Ocean—that is, the variations of thermohaline circulation, deep western boundary current, northern recirculation gyre, and Gulf Stream path—are associated with high-latitude oceanic Great Salinity Anomaly events. In particular, a dipolar sea surface temperature anomaly (warming off the U.S. east coast and cooling south of Greenland) can be triggered by the Great Salinity Anomaly events several years in advance, thus providing a degree of long-term predictability to the system. Diagno

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Schram, JB, HL Sorensen, RD Brodeur, AWE Galloway, and KR Sutherland. "Abundance, distribution, and feeding ecology of Pyrosoma atlanticum in the Northern California Current." Marine Ecology Progress Series 651 (October 1, 2020): 97–110. http://dx.doi.org/10.3354/meps13465.

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During 2016-2018, unprecedented aggregations of the colonial pelagic tunicate Pyrosoma atlanticum were observed in the Northern California Current (NCC). Pyrosomes are common in tropical and sub-tropical ocean waters, but little is known about their abundance, distribution, and trophic ecology in mid-latitude systems. To assess these factors, pyrosomes were collected during cruises in the NCC in May and August 2017. A generalized additive model (GAM) was used to identify relationships between in situ environmental variables (temperature, salinity, fluorescence) and distribution and abundance p

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Bradshaw, E. G., and M. Lester. "SABRE observations of Pi2 pulsations: case studies." Annales Geophysicae 15, no. 1 (1997): 40–53. http://dx.doi.org/10.1007/s00585-997-0040-3.

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Abstract. The characteristics of substorm-associated Pi2 pulsations observed by the SABRE coherent radar system during three separate case studies are presented. The SABRE field of view is well positioned to observe the differences between the auroral zone pulsation signature and that observed at mid-latitudes. During the first case study the SABRE field of view is initially in the eastward electrojet, equatorward and to the west of the substorm-enhanced electrojet current. As the interval progresses, the western, upward field-aligned current of the substorm current wedge moves westward across

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Deng, Zhongxin, Rui Wang, Yi Liu, et al. "Investigation of Low Latitude Spread-F Triggered by Nighttime Medium-Scale Traveling Ionospheric Disturbance." Remote Sensing 13, no. 5 (2021): 945. http://dx.doi.org/10.3390/rs13050945.

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In the current study, we investigated the mechanism of medium-scale traveling ionospheric disturbance (MSTID) triggering spread-F in the low latitude ionosphere using ionosonde observation and Global Navigation Satellite System-Total Electron Content (GNSS-TEC) measurement. We use a series of morphological processing techniques applied to ionograms to retrieve the O-wave traces automatically. The maximum entropy method (MEM) was also utilized to obtain the propagation parameters of MSTID. Although it is widely acknowledged that MSTID is normally accompanied by polarization electric fields whic

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Cheng, C. C., C. T. Russell, V. Angelopoulos, I. R. Mann, K. H. Glassmeier, and W. Baumjohann. "THEMIS observations of double-onset substorms and their association with IMF variations." Annales Geophysicae 29, no. 3 (2011): 591–611. http://dx.doi.org/10.5194/angeo-29-591-2011.

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Abstract. On 16 July 2008, two pairs of consecutive bursts of Pi2 pulsations were recorded simultaneously across the THEMIS ground-based observatory system. Wavelet transformation reveals that for each high-latitude pair, the dominant frequency of the first burst is higher than that of the second. But at low latitudes, the dominant frequency does not change. It is suggested that both pairs result from fast magnetospheric cavity waves with the second burst also containing shear Alfvén waves. INTERMAGNET magnetograms at auroral latitudes showed magnetic variations affected by two recurrent elect

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Chew, Kuew Wai, C. K. Leong, and Bok Min Goi. "Contour Data Acquisition System for Electric Vehicle Distance Estimation Method." Applied Mechanics and Materials 479-480 (December 2013): 503–7. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.503.

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The conventional distance estimation system only uses a constant speed and a constant level of road elevation to estimate the driving mileage for a vehicle. This technique leads to a low accuracy. In the current project, a new estimation technique namely; the Contour Positioning System (CPS) for an electric vehicle has been proposed. The CPS has a better estimation on the electric vehicle battery usage because of the consideration of road elevation, regenerative energy etc. In order to perform the CPS calculation, the elevation profile of the selected destination must be known. In this paper,

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Keiling, A., M. Fujimoto, H. Hasegawa, et al. "Association of Pi2 pulsations and pulsed reconnection: ground and Cluster observations in the tail lobe at 16 <i>R<sub>E</sub></i>." Annales Geophysicae 24, no. 12 (2006): 3433–49. http://dx.doi.org/10.5194/angeo-24-3433-2006.

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Abstract. Simultaneous measurements from the Cluster spacecraft and several ground stations (SAMNET, IMAGE, Kakioka, Hermanus) provide evidence for an association of Pi2 pulsations and pulsed reconnection in the magnetotail. On 8 September 2002, substorm-related Pi2 pulsations were recorded with the same waveform (same frequency) in the tail lobe at 16 RE and time-delayed on the ground (both nightside and dayside) spanning L values from 1.23 to 6.11. The tail lobe Pi2 pulsations were a series of nightside flux transfer event (NFTE) pulses propagating at a speed of 600–800 km/s towards Earth, w

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