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On the occurrence of blue asymmetry in chromospheric flare spectra

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Abstract

We present observations of optical spectra of a flare in which blue line asymmetry was seen for more than 4 min close to the flare onset. The maximum blue asymmetry coincided with the maximum of a hard X-ray and microwave burst. We discuss possible interpretations of the blue asymmetry and conclude that the most plausible one is electron-beam heating with return current. Although this process predicts downflows in the lower transition region and upper chromosphere, its ultimate effect on the line profiles can be blue asymmetry: the upper layers moving away from us absorb the radiation of the red peak thus lowering its intensity in comparison to the blue one.

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Authors and Affiliations

  1. Astronomical Institute of the Czech Academy of Sciences, Ondřejov, Czech Republic

    Petr Heinzel, Marian Karlický & Pavel Kotrč

  2. CASS, UCSD, La Jolla, USA

    Zdeněk Švestka

  3. SRON Utrecht, The Netherlands

    Zdeněk Švestka

Authors
  1. Petr Heinzel
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  2. Marian Karlický
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  3. Pavel Kotrč
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  4. Zdeněk Švestka
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Heinzel, P., Karlický, M., Kotrč, P. et al. On the occurrence of blue asymmetry in chromospheric flare spectra. Sol Phys 152, 393–408 (1994). https://doi.org/10.1007/BF00680446

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  • DOI: https://doi.org/10.1007/BF00680446

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