Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sosyr..42..536a&link_type=abstract
Solar System Research, Volume 42, Issue 6, pp.536-542
Other
1
95.50-N, 95.85Nv, 95.85Pw, 94.30Va, 94.30Ny
Scientific paper
In the absence of burst events, the typical count-rate temporal profile of the AVS-F instrument in the low-energy gamma-ray band has a single broad maximum in the geomagnetic-equator region at latitudes from -30° to +40°). However, the so-called quasi-stationary precipitations, i.e., increases in the count rate by up to 15 30% with respect to the average level determined using polynomial fits, were observed in some equatorial regions at latitudes from -25° to +30°. At least four (type I, II, III, and IV) groups of such events can be distinguished according to their temporal profiles. The temporal profiles of about 44% events show a rapid increase to the south from the geomagnetic equator and a gradual decrease in the northern direction. For about 21% of analyzed events, on the contrary, the count rate increases sharply to the north of the geomagnetic equator and decreases gradually to the south. About 4% of events have symmetric temporal profiles. Finally, another 4% of the detected events have the form of a significant (a factor of 1.3 1.8) increase in the count rate with a central maximum. Typical durations of precipitations are 7 10 min (the size of the precipitation region is 20° 35°). However, short events lasting for ˜3 min (the size of the precipitation region is ˜10°) were observed. The mean time interval in which the precipitations were observed in regions with dimensions of 10° in geographic latitude by 30° in geographic longitude was about 24 h (the maximum interval exceeded 8 days). The majority of precipitations were observed in a zone of width 40° centered at the geomagnetic equator. Quasi-stationary precipitations can be related to the precipitations of charged particles in certain regions of the Earth’s magnetosphere periodically crossed by the satellite.
Amandjolova D. B.
Arkhangelskaja Irene V.
Arkhangelsky Andrey I.
Kotov Yu. D.
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