Ion cyclotron waves during a great magnetic storm observed by Freja double-probe electric field instrument
作者： T. Bräysy , K. Mursula , G. Marklund
DOI: 10.1029/97JA02820
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摘要: Evolution of the great magnetic storm in April 1993 is studied using observations electromagnetic ion cyclotron (EMIC) waves by F1 double-probe electric field instrument onboard Freja satellite. The almost continuous operation overview mode allowed us to follow global EMIC wave activity at low altitudes above ionosphere during several subsequent days covering initial (compression), main, and recovery phases storm. During phase spatial occurrence has a postnoon high-latitude maximum, agreement with earlier statistical results. A sudden dramatic change this pattern was observed start main phase. phase, amplitudes were greatly enhanced active region moved considerably lower latitudes late evening MLT sector. Also, existence heavy ions later changed distribution frequencies dramatically. Most interestingly, number oxygen band limited period about 7 hours asymmetric these implies that loss rate faster than drift rate. results suggest play crucial role early
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