Low photosphere of the sun's active regions preceding flares and those without flares. I - The Fraunhofer spectrum

Details Low photosphere of the sun's active regions preceding flares and those without flares. I - The Fraunhofer spectrum Low photosphere of the sun's active regions preceding flares and those without flares. I - The Fraunhofer spectrum

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993kfnt....9...24a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 9, no. 1, p. 24-36.

Computer Science

Fraunhofer Lines, Photosphere, Solar Atmosphere, Solar Flares, Flocculating, H Beta Line, Solar Activity

Scientific paper

A comparative analysis of several photospheric spectral lines is carried out for 50 active solar regions preceding flares ('active flocculi') and for 30 regions without flares ('quiet flocculi'). The lines which form in lower photospheric layers (h equal to or less than 100 km) are found to strengthen in both types of flocculi as compared to the quiet photosphere. On the contrary, the lines which form in higher photospheric layers are weakened. All the lines in flocculi are widened to a various degree. The difference between active and quiet flocculi is noticeable already 3-10 hours before the onset of flares irrespective of their importance, with the difference manifesting itself mainly in a greater widening of deep-forming lines in active flocculi. These lines begin to show a tendency to become weaker 1-3 hours before the onset of flares. In some cases, the lines can become stronger and wider again immediately (less than 1 h) before flares. This might be a result of fast-running processes which spread over the lowest photospheric layers as well.

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