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Effect of electron beams during solar flares

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Abstract

Electron bombardment of the solar atmosphere has two effects: one is to enhance hydrogen recombination emission, the other is to increase the opacity via an increase of H− population. The first effect is the most important in the upper part of the atmosphere and the second in the lower part. We predict that, when enhanced absorption dominates in the part of the atmosphere where radiation originates, there will be a decrease in the white-light emission, leading to a ‘negative flare’, or what we call a ‘Black-Light Flare’. This phenomenon occurs only for a short duration, not more than ∼ 20 s. ‘Black-Light Flares’ have already been observed in the case of flare stars and we suggest here that they could also be present on the Sun, just prior to a White-Light Flare.

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Authors and Affiliations

  1. Section d'Astrophysique, Observatoire de Paris, F-92190, Meudon Principal, France

    J. Aboudarham, J. C. Henoux, J. C. Brown, G. H. J. Van Den Oord, L. Van Driel-Gesztelyi & O. Gerlei

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  1. J. Aboudarham
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  2. J. C. Henoux
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  3. J. C. Brown
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  4. G. H. J. Van Den Oord
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  5. L. Van Driel-Gesztelyi
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  6. O. Gerlei
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Additional information

Also Dept. of Physics and Astronomy, University of Glasgow, Scotland.

Also Sterrekundig Instituut, Rijksuniversiteit te Utrecht, The Netherlands.

Also Heliophysical Observatory of the Hungarian Academy of Sciences, Debrecen, Hungary.

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Aboudarham, J., Henoux, J.C., Brown, J.C. et al. Effect of electron beams during solar flares. Sol Phys 130, 243–251 (1990). https://doi.org/10.1007/BF00156792

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  • DOI: https://doi.org/10.1007/BF00156792

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