Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..528w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 528-532.
Astronomy and Astrophysics
Astrophysics
40
Fine Structure, Penumbras, Solar Magnetic Field, Sunspots, Field Strength, Solar Spectra, Spatial Resolution, Zeeman Effect
Scientific paper
Spatially very highly resolved spectra of sunspot penumbrae show that the Evershed effect is not spatially related to the continuum intensity fluctuations. The line asymmetry and the core shift (both a signature of the Evershed effect) show fluctuations at a larger horizontal scale than the continuum and a trend for an anticorrelation, in the sense that locations with smaller asymmetry trend to show larger shifts. The Zeeman broadening also shows variations at a larger spatial scale than the continuum. There is no indication for field enhancements in dark continuum streaks, some spots even show a certain trend for enhanced field strengths in bright streaks. The absence of a general relation to continuum streaks might be explained by the finding that the continuum structures in the spectrum are almost invisible at the formation height of the Fe 5576-A line, where a coarser spatial structure of a few arcsec width occurs.
Stellmacher Goetz
Wiehr Eberhard
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