The Coronas-F Space Mission

Volume 400 of the series Astrophysics and Space Science Library pp 393-403


Study of Solar Flares and Gamma-Ray Bursts in the Helicon Experiment

  • E. P. MazetsAffiliated withIoffe Institute 
  • , R. L. AptekarAffiliated withIoffe Institute Email author 
  • , S. V. GolenetskiiAffiliated withIoffe Institute
  • , V. N. Il’inskiiAffiliated withIoffe Institute
  • , V. D. Pal’shinAffiliated withIoffe Institute
  • , Z. Ya. SokolovaAffiliated withIoffe Institute
  • , D. D. FrederiksAffiliated withIoffe Institute
  • , M. V. UlanovAffiliated withIoffe Institute

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Detailed data on temporal profiles, energy spectra, and spectral variability of hard X-ray and gamma-ray flares of solar origin have been obtained in the energy range from 10 keV to 10 MeV in the Helicon experiment for the entire period of observations, beginning with the solar activity maximum in 2001. Synchronously with the KONUS–WIND experiment onboard the U.S. Wind spacecraft, the Helicon experiment has also investigated cosmic gamma-ray bursts and soft gamma repeaters. The Helicon instrument performed unique observations of the giant flare from SGR1806-20 soft gamma repeater and of its reflection from the Moon. The intensity, history, and energy of the initial pulse of the giant flare from the gamma repeater are reconstructed for the first time with high reliability. A natural location of the Moon by a high-intensity flux of X-ray and gamma radiation has been recorded for the first time in the history of the extraterrestrial astronomy.