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

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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.

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Authors and Affiliations

  1. St. Petersburg State Technical University, 195251, St. Petersburg, Russia

    L. G. Kocharov

  2. A. F. Ioffe Physico-Technical Institute, 194021, St. Petersburg, Russia

    G. A. Kovaltsov, G. E. Kocharov, E. I. Chuikin & I. G. Usoskin

  3. Space Physics Division, Geophysics Directorate Phillips Laboratory, Hanscom AFB, 01731-3010, Bedford, MA, USA

    M. A. Shea & D. F. Smart

  4. Radiophysical Research Institute, 603600, Nizhny Novgorod, Russia

    V. F. Melnikov & T. S. Podstrigach

  5. University of Kansas, 66045, Lawrence, KS, USA

    T. P. Armstrong

  6. Big Bear Solar Observatory, California Institute of Technology, 91125, Pasadena, CA, USA

    H. Zirin

Authors
  1. L. G. Kocharov
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  2. G. A. Kovaltsov
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  3. G. E. Kocharov
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  4. E. I. Chuikin
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  5. I. G. Usoskin
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  6. M. A. Shea
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  7. D. F. Smart
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  8. V. F. Melnikov
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  9. T. S. Podstrigach
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  10. T. P. Armstrong
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  11. H. Zirin
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Kocharov, L.G., Kovaltsov, G.A., Kocharov, G.E. et al. Electromagnetic and corpuscular emission from the solar flare of 1991 June 15: Continuous acceleraton of relativistic particles. Sol Phys 150, 267–283 (1994). https://doi.org/10.1007/BF00712889

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  • DOI: https://doi.org/10.1007/BF00712889

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