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Extreme midlatitude auroras during the geomagnetic storms
on October 29-31 and November 20-21, 2003
Mikhalev A.V., Beletsky A.B., Kostyleva N.V., Chernigovskaya M.A.,
The preliminary results of the optical midlatitude aurora observations at the RAS SB ISTP geophysical observatory in the South of Eastern Siberia (52 N, 103 E) during the two strong geomagnetic storms on October 29-31 and November 20-21, 2003, are under analysis. The observation results are compared with the similar midlatitude aurora data observed earlier at the geophysical observatory. The registered maximum intensity of the atmospheric emissions and concomitant gelio-geophysical conditions allow to conclude that the midlatitude auroras under analysis may be related to the extremal ones observed at this latitudes according to their optical manifestation. In separate temporal intervals the disturbances of the atmospheric emissions may be interpreted as "ordinary" aurora with the manifestation of substorm activity.
This work was done under grant No. NSh-272.2003.5 of state support of leading scientific schools of the Russian Federation, and with support from the RFBR - grant No. 03-05-64744.