Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..352w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 352-356.
Astronomy and Astrophysics
Astrophysics
29
Penumbras, Solar Spectra, Sunspots, Fine Structure, Iron, Line Spectra, Spatial Resolution
Scientific paper
An experimental investigation of the effect of penumbral fine structure on the line profiles of Ti 5222.7 A and Fe(+) 5264.8 is presented. The highly resolved penumbral spectrum was observed with the evacuated Locarno telescope of the Goettingen observatory. It is shown that the highly excited Fe(+) line has a strong correlation in its line symmetry to bright spectrum streaks. Line core shift was correlated with dark spectrum streaks. The Doppler shift of the Be(+) line increased by 1.2 km/s, and that of the Ti line by 0.7 km/s for a continuum brightness decrease of 20 percent. On the basis of the observational data, it is concluded that the two-component model of sunspot penumbrae is unlikely. It is suggested that Evershed asymmetry originates mainly from a mixture of fine structure.
Knoelker Michael
Koch Alan
Kueveler G.
Stellmacher Goetz
Wiehr Eberhard
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