Inflight calibration and results of treatment of data from the AVS-F apparatus onboard the CORONAS-F satellite

1Arkhangelskaya, IV, 2Kotov, Yu.D, 1Arkhangelskii, AI, 2Glianenko, AS
1Institute of Astrophysics, Moscow Engineering Physics Institute (State University), Moscow, Russia
2National Research Nuclear University «MEPhI», Moscow, Russia
Kosm. nauka tehnol. 2003, 9 ;(Supplement2):066-075
Publication Language: Russian
The AVS-F apparatus is intended for the study of characteristics of hard X-ray and γ-ray fluxes from the Sun, solar flares, γ-ray bursts and for the investigation of fluxes of neutrons. The experiment is carried out onboard the satellite CORONAS-F. Results of the SONG-D data processing are discussed. On the basis of data of the SONG-D in-flight calibrations, the boundaries of detection ranges for γ-rays are found to be (0.127±0.023) – (11.1±0.043) MeV (low energy band) and (4.4±1.4) – (94±3) MeV (high energy band). During two-year operation of the AVS-F apparatus, about 2500 flare events were detected. From them, 8 % are solar flares confirmed by an analysis of the GOES and HESSI data; 0.5 % are γ-ray bursts confirmed by the analysis of the HETE data, 57 % are events obviously of magnetosphere origin, 8 % are events not obviously magnetosphere origin but not confirmed by the analysis of the HETE, GOES, and HESSI data, and 26.5 % of events are quasistationary equatorial precipitations with a duration of several hundred seconds which were observed on some sequential orbits in the equatorial area and also well identified on count rate maps created on the basis of the data averaged over a month. The number of such precipitations for one month is not constant but also not obviously depend on the number of solar flares in γ-range. Short events with a duration of some milliseconds were detected. They are very similar to γ-events a source of which is the Earth's atmosphere (Terrestrial Gamma Flashes). It is supposed that TGF occur during electrical discharge between a high layer of thunderstorm clouds and ionosphere.

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