Vol. 18, issue 01-02, article # 25
Mikhalev A. V., Beletsky A. B., Kostyleva N. V., Chernigovskaya M. A. Characteristics of midlatitude aurorae during large geomagnetic storms within the current solar cycle. // Atmospheric and oceanic optics. 2005. V. 18. No. 01-02. P. 144-148.
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Abstract:
We present the characteristics of most intense midlatitude aurorae in Eastern Siberia (52° N, 103° E), observed during large geomagnetic storms on April 6-7, 2000, March 31, 2001, and October 29-31 and November 20-21, 2003. Depending on the level of geomagnetic activity and phase of magnetic storm, the recorded midlatitude aurorae can be classified into different types of midlatitude aurorae: (1) d-type (with a predominant emission at 630 nm), (2) SAR arcs (630 nm), and (3) auroral type (558 and 630 nm) with the occurrence of sub-storm activity. We discuss the observed specific features of occurrence of midlatitude aurorae at specific times of the day (UT dependence) and their relation to the magnetic-ionospheric structures.
