Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..821d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 821-826.
Astronomy and Astrophysics
Astrophysics
88
Magnetic Field Configurations, Penumbras, Solar Magnetic Field, Spatial Distribution, Sunspots, Astronomical Spectroscopy, Doppler Effect, Field Strength, Inclination, Solar Limb
Scientific paper
Stokes-V-spectra from a sunspot penumbra show significant spatial fluctuations. Due to its deep formation layer, the Fe 6842.7 used is totally split (B = 2200 Gs) showing field fluctuations of the order of 10 percent. The spatial variations of the Stokes-V spectra are strongly affected by telescopic phase retardation thus allowing only a rough estimate of the inclination angle. Its fluctuation to the solar surface is spatially related to the field-strength fluctuation in the sense that steeper fields are stronger. Doppler shifts of the Stokes-V give slight indication for upward motions at locations of steeper field inclination. A relation with the continuum-intensity fluctuation is only found in the center-side penumbra, possibly due to the steeper angle-of-view. The absence of a similar correlation in the limb-side spectra agrees with earlier findings that field strength and Evershed effect are not related to penumbral fine-structures.
Degenhardt Detlev
Wiehr Eberhard
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