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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 6 | Copyright
Ann. Geophys., 23, 2239-2247, 2005
https://doi.org/10.5194/angeo-23-2239-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  15 Sep 2005

15 Sep 2005

Gamma rays in L-B coordinates at CORONAS-I altitude

R. Bučík1, K. Kudela1, S. N. Kuznetsov2, and I. N. Myagkova2 R. Bučík et al.
  • 1Institute of Experimental Physics, SAS, 043 53 Košice, Slovakia
  • 2Institute of Nuclear Physics, Moscow State University, 119899 Moscow, Russia

Abstract. We present here observations of gamma rays in the energy range between 3.0 and 8.3 MeV gathered by the SONG instrument aboard low-altitude polar-orbiting satellite CORONAS-I throughout the period March-June 1994. We concentrate on the emissions related to the trapped particles and organize CORONAS-I measurements in the magnetic L–B coordinate system. The spatial distribution of the average gamma-ray counts reveals that the most intense fluxes were observed under the inner radiation belt, at L<2, and that they are exclusively confined into the region of stably trapped particles, where daughter gamma rays could result from the interactions within the spacecraft and instrumental matter. In the outer radiation zone (L~4), the enhanced gamma radiation, also detected outside the stably trapping region, shows pronounced longitudinal variations. The observed eastward increase in the gamma-ray count rate suggests quasi-traped energetic (megavolt) electrons as a source of the gamma rays both in the upper atmosphere and in the satellite matter, most likely, through the bremsstrahlung process in the studied energy domain.

Keywords. Magnetospheric physics (Energetic particles, precipitating; Energetic particles, trapped; Magnetosphereionosphere interactions)

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