Photospheric layers of flares and plages. I - Profiles, asymmetry, and shifts of Fraunhofer lines

Details Photospheric layers of flares and plages. I - Profiles, asymmetry, and shifts of Fraunhofer lines Photospheric layers of flares and plages. I - Profiles, asymmetry, and shifts of Fraunhofer lines

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13d..61k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 13, p. 61

Physics

Solar Flares, Photosphere, Fraunhofer Lines, Spectral Line Width, Line Shape, Shock Wave Propagation

Scientific paper

The differences in the behavior of 16 Fraunhofer line profiles in the quiet plage and during a small flare, their asymmetries and shifts have been identified in the range 629-633 nm. In the flare spectra, the lines are red-shifted with respect to the corresponding lines in the undisturbed photosphere and plage spectra. The bisector shapes of these lines differ too. The variations of the line profile parameters depend greatly on the flare phase and on the line formation depth. They may be caused by changes in thermodynamical properties of the photosphere because of the spread of the shock wave from the flare down to lower atmospheric layers.

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