Positive and negative feedbacks in the magnetosphere-ionosphere coupling

Мишин, В. М.; Kurikalova, Marina; Sapronova, L. A.; Karavaev, Yu. A.

doi:10.1016/j.jastp.2019.03.002

Cited by 5 publications

(9 citation statements)

References 75 publications

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“…The winter (northern) and summer (southern) ionospheres are connected in parallel to an external generator in the magnetosphere. Furthermore, it is assumed that between the ionospheres is an additional connection through the partial ring current [Mishin et al, 2011]. Due to the difference between conductivities in the summer and winter hemispheres, we can predict the presence of asymmetry in the distribution of FACs of two types at a time: dawn-dusk and interhemispheric, which is similar to that the open magnetosphere model and observations assume, but in terms of another factor the azimuthal component of the interplanetary magnetic field (IMF).…”

Section: Introductionsupporting

confidence: 70%

“…The conclusions that the FAC magnitude in the summer hemisphere is higher than in the winter one are consistent as they follow from Ohm's law for the electric circuit with paralleled loadings-ionospheres. Note, however, that the global virtual model of electric circuit of the magnetosphere and two ionospheres [Mishin et al, 2011[Mishin et al, , 2019 deals with FAC intensities in mesoscale cells on the night side. Direct comparison of our results with this model is, therefore, not quite correct because above we have considered intensities in the entire FAC regions, including their day side.…”

Section: Discussionmentioning

confidence: 99%

“…That is why these results, although consistent with the findings of this model, cannot confirm them. It is necessary to analyze events with oppositely directed azimuthal field or without it (B y ≤0), as well as to delve into the dynamics of intensities in mesoscale cells of FAC on the night side, taking into account the FAC system rotation during a substorm observed in [Mishin et al, 2019].…”

Section: Discussionmentioning

confidence: 99%

“…As a result, we obtained time variations of current intensities in each of the three FAC regions for both hemispheres during the August 17, 2001 geomagnetic storm. Below, we restrict the analysis to the dynamics of region 1 FAC pair (Figure 2) in both hemispheres since it is precisely through the pair of these currents that the magnetospheric generator feeds the northern and southern polar ionospheres [Mishin et al, 2011]. The region 1 FAC intensity is approximately equal to the sum of region 2 and 0 FAC intensities (I R1 ≈I R2 +I R0 ) both in dawn and dusk sectors of the ionosphere [Kurikalova et al, 2018].…”

Section: Solar Wind and Geomagnetic Activity Parametersmentioning

confidence: 99%

“…Because of the small number of stations in the Southern Hemisphere, such an analysis with MIT is usually performed using data only from Northern Hemisphere observatories. To study the substorm dynamics in the Southern Hemisphere, Mishin et al [2011Mishin et al [ , 2019 have proposed a virtual model of the global electric circuit of the magnetosphereionosphere system in the two hemispheres. The model uses data on two events recorded only in the Northern Hemi-sphere, but during different seasons (winter and summer).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamics of field-aligned currents in two hemispheres during a magnetospheric storm from magnetogram inversion technique data

Мишин

Karavaev

Lunyushkin

et al. 2021

Solar-Terrestrial Physics

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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.

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Section: Introductionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Solar Wind and Geomagnetic Activity Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamics of field-aligned currents in two hemispheres during a magnetospheric storm from magnetogram inversion technique data

Мишин

Karavaev

Lunyushkin

et al. 2021

Solar-Terrestrial Physics

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Westward propagation of substorm by THEMIS and ground-based observations

Despirak

Kozelova

Kozelov

et al. 2020

Journal of Atmospheric and Solar-Terrestrial Physics

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Dynamics of the field-aligned currents distribution asymmetry during substorms in the equinox season

Мишин

Kurikalova

2021

Solar-Terrestrial Physics

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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 two hemispheres, using the modernized magnetogram inversion technique. The results obtained on the dynamics of the FAC asymmetry of two types (dawn–dusk and interhemispheric), as well as the previously obtained regularities in the behavior of Hall currents and 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.

show abstract

Positive and negative feedbacks in the magnetosphere-ionosphere coupling

Cited by 5 publications

References 75 publications

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

Westward propagation of substorm by THEMIS and ground-based observations

Dynamics of the field-aligned currents distribution asymmetry during substorms in the equinox season

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