Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103..211s&link_type=abstract
Astronomy and Astrophysics, vol. 103, no. 2, Nov. 1981, p. 211-215.
Astronomy and Astrophysics
Astrophysics
12
Fine Structure, Line Spectra, Penumbras, Solar Magnetic Field, Sunspots, Iron, Solar Spectra, Solar Temperature, Spatial Resolution, Spectral Energy Distribution, Stellar Models, Stellar Structure, Titanium
Scientific paper
Spectra at high spatial resolution are taken in a sunspot penumbra at disc center. The magnetic low sensitive lines Fe (+) 5264.8 (g equals 0.1) and Ti 5222.7 (g equals 0) as well as the large split line Fe 6302.3 are analyzed by comparison with model calculations. No systematic fluctuations of the magnetic field strength and inclination are found in the bright and dark spectral streaks, b and d. It is shown that this result is still compatible with actual field fluctuations of less than or equal to 1,000 G between the individual penumbral bright and dark regions, BR and DR. The observed fluctuations of the central intensity of the two oppositely temperature sensitive Fe(+) and Ti lines are essentially smaller than expected from the continuum fluctuations. The DR model requires a larger macro turbulence parameter than the BR model in agreement with a spatially low resolved Evershed flow in the DR.
Stellmacher Goetz
Wiehr Eberhard
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