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Journals / Volume 7 Issue 1 / Dynamics of field-aligned currents in two hemispheres during a magnetospheric storm from magnetogram inversion technique data
UDC 55

DYNAMICS OF FIELD-ALIGNED CURRENTS IN TWO HEMISPHERES DURING A MAGNETOSPHERIC STORM FROM MAGNETOGRAM INVERSION TECHNIQUE DATA Dynamics of field-aligned currents in two hemispheres during a magnetospheric storm from magnetogram inversion technique data

Published in Untitled · Volume 7, Issue 1 · Pages 34–39 · Rubric: Results of current research
DOI: https://doi.org/10.12737/szf-71202104
Received: 08.12.2020 Accepted: 08.02.2021 Language of publication: RUS
Authors
VL
Vladimir Mishin
YU
Yuriy Karavaev
SE
Sergey Lunyushkin
YU
Yury Penskikh
et al.
VY
Vyacheslav Kapustin
ABSTRACT
We continue to study the physical processes occurring during the August 17, 2001 magnetospheric storm by analyzing the dynamics of the intensity of field-aligned currents (FACs) in Iijima—Potemra Region 1 in the polar ionospheres of the two hemispheres, using the modernized magnetogram inversion technique. The results obtained on the dynamics of two types of FAC asymmetry (dawn-dusk and interhemispheric), as well as the previously obtained regularities in the behavior of Hall currents and the polar cap boundaries depending on the large azimuthal component of the interplanetary magnetic field (IMF), observed during the storm, and the seasonal behavior of the conductivity are consistent with the open magnetosphere model and with satellite observations of auroras in two hemispheres. We have shown that the weakening of the asymmetry of two types in the FAC distribution during substorms in the storm under study occurs almost completely in the winter hemisphere and is much weaker in the summer one. We associate this phenomenon with the predominance of the effect of long-term exposure to the azimuthal IMF component in the sunlit polar ionosphere of the summer hemisphere over the substorm symmetrization effect of the night magnetosphere. A symmetrization effect of the polar cap and FACs, created by the solar wind pressure pulse at the end of the storm, is observed. We propose a qualitative explanation of this effect.
KEYWORDS
polar cap, field-aligned currents, magnetospheric storms and substorms, azimuthal component of the interplanetary magnetic field, dawn–dusk and interhemispheric asymmetries
Funding
The work was financially supported by Basic Research program II.16 and in part by RFBR (grants Nos. 18-05-00437, 19-05-00665)
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