Unusual Behavior of Averaged K CAII Line Profile in Solar Disk Center

Details Unusual Behavior of Averaged K CAII Line Profile in Solar Disk Center Unusual Behavior of Averaged K CAII Line Profile in Solar Disk Center

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987atsir1512....5d&link_type=abstract

Astronomicheskii Tsirkulyar NO. 1512/SEP, P. 5, 1987

Astronomy and Astrophysics

Astronomy

Scientific paper

Averaged profiles of the solar Ca II K line were observed at the Solar Telescope on the Sayansk Observatory on July 6 and 9, 1986. At the limb the profile has the usual structure with the K3 minimum and two K2 emission peaks. In the centre of the disc, the profile has an unusual asymmetry with the red emission peak K2R completely lacking. The disappearance of the K2R peak was earlier observed in some fine-structure features on the Sun but it was never seen in averaged profiles. This effect seems to be not instrumental but of solar origin.

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