Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Field-aligned Currents Dependent on the Northward IMF in the Transition Current System at the Beginning of Severe Magnetic Storm
Belenkaya E.S., Alexeev I.I., Clauer C.R.Jr.,

We consider the interaction of a coronal mass ejection (CME) with the magnetosphere at the beginning of the severe magnetic storm for the specific case when a sharp increase in the dynamic pressure (interplanetary shock) is associated with a simultaneous northward turning of the interplanetary magnetic field (IMF). The magnetospheric response to such conditions has been observed to be atypical to that expected for the compression of the magnetosphere. The sudden magnetic field increase observed at low latitude ground stations in response to such an event is asymmetric, with the largest field enhancement observed on the night side and little or no field increase observed near local noon. We explain this response in terms of a temporary transition current system that is generated in the high latitude magnetosphere in response to the northward turning of the IMF. We calculate the dependence of distribution of field-aligned currents in the transition current system on the radial and azimuthal components of the IMF.





Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004