Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..313w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 313-317.
Astronomy and Astrophysics
Astrophysics
25
Gas Flow, Penumbras, Solar Spectra, Spatial Distribution, Sunspots, Line Shape, Spectral Correlation
Scientific paper
Spectra of a sunspot penumbra at 27 deg are taken in four adjacent slit positions at exceptionally good seeing conditions, yielding smallest continuum structures of 0.35 arcsec width. The Doppler shifts of line-core and line-wings of the nonmagnetic line Fe I 7090.4 are cospatial, but their amplitudes are unrelated. The amount of line asymmetry is thus not related to the corresponding line-core shift. A good correlation with the continuum occurs only in spectra achieving highest spatial resolution. A slightly less resolved spectrum does not show a similar correlation, thus explaining the missing relation in former observations. The amplitudes of shift and asymmetry are not related to those of the continuum intensity. The lack of any amplitude relation in spite of an almost perfect spatial correlation among shift, asymmetry, and continuum might be explained by the different angles-of-view through fine structures aligned along flux tubes of individual inclination angles recently observed. In addition, actual penumbral structures being essentially smaller than 250 km as deduced from white light pictures might yield different influences of spatial smearing on continuum, line shift, and line asymmetry.
Degenhardt Detlev
Wiehr Eberhard
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