Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..402w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 402-406.
Astronomy and Astrophysics
Astrophysics
33
Penumbras, Solar Magnetic Field, Sunspots, Continuous Spectra, Photosphere, Solar Spectra, Spectral Line Width
Scientific paper
Spatially high-resolved spectra of a small split line (g = 0.5) in four sunspots at different heliographic angles show that the combined effect of line core velocities and line asymmetries (defined as Evershed effect) is strongly limited to the sunspot area defined by the continuum intensity step. Occasionally observed 'adjoining velocity maxima' just outside the sunspot edges are not related to line asymmetries, thus indicating a different origin than that of the classical Evershed effect. A similar concentration of the very spot area is found for the magnetic line broadening of two large split lines. Both results indicate that magnetic field and velocity field are sharply restricted to the visible sunspot, the often observed smooth discontinuity of both quantities are thus considered to be due to seeing.
Grosser Hartmut
Knoelker Michael
Stellmacher Goetz
Wiehr Eberhard
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