High latitude magnetospheric topology and magnetospheric substorm

Антонова, Е. Е.; Kirpichev, I. P.; Ovchinnikov, I. L.; Orlova, K.; Stepanova, M. V.

doi:10.5194/angeo-27-4069-2009

Cited by 24 publications

(7 citation statements)

References 30 publications

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“…This type of current lines also appears in the magnetohydrodynamic (MHD) models of high latitude transverse currents (Liemohn et al 2011 ). Initial estimates of CRC intensities have been made by Antonova et al ( 2009a , b ) and Kirpichev and Antonova ( 2014 ). Thus, the existence of the CRC, which is not included in existing geomagnetic field models with fixed geometry, poses a problem for mapping the auroral regions to the equatorial plane, or, more exactly, to the surface of minimal magnetic field values.…”

Section: Resultsmentioning

confidence: 99%

Problems with mapping the auroral oval and magnetospheric substorms

et al. 2015

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Accurate mapping of the auroral oval into the equatorial plane is critical for the analysis of aurora and substorm dynamics. Comparison of ion pressure values measured at low altitudes by Defense Meteorological Satellite Program (DMSP) satellites during their crossings of the auroral oval, with plasma pressure values obtained at the equatorial plane from Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellite measurements, indicates that the main part of the auroral oval maps into the equatorial plane at distances between 6 and 12 Earth radii. On the nightside, this region is generally considered to be a part of the plasma sheet. However, our studies suggest that this region could form part of the plasma ring surrounding the Earth. We discuss the possibility of using the results found here to explain the ring-like shape of the auroral oval, the location of the injection boundary inside the magnetosphere near the geostationary orbit, presence of quiet auroral arcs in the auroral oval despite the constantly high level of turbulence observed in the plasma sheet, and some features of the onset of substorm expansion.

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Section: Resultsmentioning

confidence: 99%

Problems with mapping the auroral oval and magnetospheric substorms

et al. 2015

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“…In magnetostatic equilibrium, it is possible to calculate the current density knowing the plasma pressure and magnetic field. Antonova et al () estimated the value of the transverse currents in the inner magnetosphere and showed that the total transverse current at the dayside field lines is comparable with the total transverse current near midnight at the same geocentric distances. This means that this current closes inside the magnetosphere, forming a high‐latitude continuation of the ordinary RC (Antonova et al, ).…”

Section: Discussionmentioning

confidence: 99%

Multisatellite Analysis of Plasma Pressure in the Inner Magnetosphere During the 1 June 2013 Geomagnetic Storm

et al. 2019

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Using data from Defense Meteorological Satellite Program 16–18, National Oceanic and Atmospheric Administration 15–19, and METOP 1–2 satellites, we reconstructed for the first time a two‐dimensional statistical distribution of plasma pressure in the inner magnetosphere during the 1 June 2013 geomagnetic storm with time resolution of 6 hr. Simultaneously, we used the data from Van Allen Probes and Time History of Events and Macroscale Interactions missions to obtain the in situ plasma pressure in the equatorial plane. This allowed us to corroborate that the dipole mapping works reasonably well during the storm time and that variations of plasma pressure are consistent at low and high altitudes; namely, we observed a drastic increase in plasma pressure a few hours before the storm onset that continued during the storm main phase. Plasma pressure remained elevated during the first 18 hr of the recovery phase and then started to decrease to normal levels. We found that the variation in pressure correlates with the change in the slope of the Dst index, and that the plasma pressure nearly conserved its axial symmetry during the storm, giving one more evidence that the ring current provides the main contribution to the Dst variation. We also found that the plasma pressure in the magnetosphere correlates with the solar wind dynamic pressure with a correlation coefficient exceeding 0.9, which can be related to the pressure balance at the magnetospheric flanks. The results obtained here agree with the concept of the ring current generation by an inner magnetosphere plasma ring in magnetostatic equilibrium.

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“…Figure presents the schematic view of the cut ring current shown by the yellow ribbon. The initial verification of the existence of such a current was done by analyzing the radial profiles of plasma pressure gradients obtained from the THEMIS‐B satellite data (Antonova et al, ) but an extensive analysis of the global plasma pressure distribution is still required.…”

Section: Main Current Systemsmentioning

confidence: 99%

Current Systems in the Earth's Magnetosphere

Ganushkina

Liemohn

Dubyagin

2018

Reviews of Geophysics

106

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The basic structure and dynamics of the primary electric current systems in the Earth's magnetosphere are presented and discussed. In geophysics, the word current is used to describe the flow of mass from one location to another, and its analog of electric current is a flow of charge from one place to another. An electric current is associated with a magnetic field, and they combine with the Earth's internally generated dipolar magnetic field to form the topology of the magnetosphere. The concept of an electric current is reviewed and compared with other approaches to investigate the physics of the magnetosphere. The implications of understanding magnetospheric current systems are discussed, including paths forward for new investigations with the robust set of observations being produced by the numerous scientific and commercial satellites orbiting Earth.

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High latitude magnetospheric topology and magnetospheric substorm

Cited by 24 publications

References 30 publications

Problems with mapping the auroral oval and magnetospheric substorms

Problems with mapping the auroral oval and magnetospheric substorms

Multisatellite Analysis of Plasma Pressure in the Inner Magnetosphere During the 1 June 2013 Geomagnetic Storm

Current Systems in the Earth's Magnetosphere

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