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A comparison of the optical and microwave emissions of some major solar flares

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Abstract

In the first part of the paper, we study the relations between the frequency of maximum radio flux f max and the magnetic field strength at the photosphere B p and between the maximum radio flux F max and the field and its scale L for two differing flares occurring above very different photospheric conditions. It is shown that the simple relations predicted by the gyro-synchrotron emission mechanism f max ∼ B p and F max ∼ B 2 L 2 account for the fact that the flares produced microwave bursts of about the same F max, but of differing f max.

The spectra of type IVμ radio bursts associated with three large proton flares with post-flare loops have been analyzed. It is found that the decimetric peak vanishes with the onset of the first optical loops. This is consistent with the model of Kopp and Pneuman (1976) which associates growing systems of loops with gradual fieldline reconnection above flaring regions.

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Authors and Affiliations

  1. Observatoire astronomique du Mont Mégantic and Département de Physique, Université Laval, G1K 7P4, Québec, Qué., Canada

    Jean-René Roy

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  1. Jean-René Roy
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Roy, JR. A comparison of the optical and microwave emissions of some major solar flares. Sol Phys 64, 143–157 (1979). https://doi.org/10.1007/BF00151123

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  • DOI: https://doi.org/10.1007/BF00151123

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