Solar Physics

, Volume 150, Issue 1–2, pp 267–283 | Cite as

Electromagnetic and corpuscular emission from the solar flare of 1991 June 15: Continuous acceleraton of relativistic particles

  • L. G. Kocharov
  • G. A. Kovaltsov
  • G. E. Kocharov
  • E. I. Chuikin
  • I. G. Usoskin
  • M. A. Shea
  • D. F. Smart
  • V. F. Melnikov
  • T. S. Podstrigach
  • T. P. Armstrong
  • H. Zirin
Article
Received:

Abstract

Data on X-,γ-ray, optical and radio emission from the 1991 June 15 solar flare are considered. We have calculated the spectrum of protons that producesγ-rays during the gradual phase of the flare. The primary proton spectrum can be described as a Bessel-function-type up to 0.8 GeV and a power law with the spectral index ≈3 from 0.8 up to 10 GeV or above. We have also analyzed data on energetic particles near the Earth. Their spectrum differed from that of primary protons producingγ-ray line emission. In the gradual phase of the flare additional pulses of energy release occurred and the time profiles of cm-radio emission andγ-rays in the 0.8–10 MeV energy band and above 50 MeV coincided. A continuous and simultaneous stochastic acceleration of the protons and relativistic electrons at the gradual phase of the flare is considered as a natural explanation of the data.

Keywords

Flare Solar Phys Solar Flare Radio Emission Interplanetary Magnetic Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • L. G. Kocharov
    • 1
  • G. A. Kovaltsov
    • 2
  • G. E. Kocharov
    • 2
  • E. I. Chuikin
    • 2
  • I. G. Usoskin
    • 2
  • M. A. Shea
    • 3
  • D. F. Smart
    • 3
  • V. F. Melnikov
    • 4
  • T. S. Podstrigach
    • 4
  • T. P. Armstrong
    • 5
  • H. Zirin
    • 6
  1. 1.St. Petersburg State Technical UniversitySt. PetersburgRussia
  2. 2.A. F. Ioffe Physico-Technical InstituteSt. PetersburgRussia
  3. 3.Space Physics Division, Geophysics Directorate Phillips LaboratoryHanscom AFBBedfordUSA
  4. 4.Radiophysical Research InstituteNizhny NovgorodRussia
  5. 5.University of KansasLawrenceUSA
  6. 6.Big Bear Solar ObservatoryCalifornia Institute of TechnologyPasadenaUSA

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