Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..521h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 521-532.
Astronomy and Astrophysics
Astrophysics
14
Calcium, Line Spectra, Photosphere, Solar Activity, Solar Spectra, Spatial Resolution, Fine Structure, Solar Activity Effects, Solar Magnetic Field, Spectral Resolution
Scientific paper
Spatially highly resolved solar photospheric line profiles are analyzed by calculating bisectors, line center velocities, and line asymmetries in order to investigate the influence of magnetic fields on these parameters. A set of three spectrograms containing regions of different magnetic activity is used. In the active regions, a reduction of continuum intensity fluctuations as well as small-scale velocity fluctuations is confirmed; however, on subgranual scales, the continuum intensity fluctuations and line center velocities for the lines originating higher than 200 km in the troposphere are found to be increasing in active regions and becoming equal to or higher than those in nonactive regions. Significant changes are observed in the profiles: the mean line asymmetry is negative in the nonactive regions and positive with a reduction of the standard deviation in the active regions.
Hanslmeier Arnold
Mattig Wolfgang
Nesis Anastasios
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