Line shifts and asymmetries in sunspot penumbrae

Details Line shifts and asymmetries in sunspot penumbrae Line shifts and asymmetries in sunspot penumbrae

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..157s&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 157-162.

Astronomy and Astrophysics

Astrophysics

42

Asymmetry, Fine Structure, Line Spectra, Penumbras, Solar Spectra, Sunspots, Doppler Effect, Spectrum Analysis, Zeeman Effect

Scientific paper

The paper considers the line shifts and asymmetries in sunspot penumbrae. Spatially unresolved spectra show decreasing shifts of line cores and increasing symmetries with height; it is shown that a decomposition of the asymmetric profiles into a main component and a satellite yields contradictory results when considering the depth dependence and the center-to-limb variation of different lines. Line profiles from the bright and dark spectral streaks are analyzed, showing that line widths, residual intensities, and asymmetries increase with increasing line shift. Finally, an attempt is made to simulate the bright and dark line profiles by simple superposition of intrinsic profiles from the bright and dark penumbral regions calculated with the corresponding models given by Kjeldseth-Moe and Maltby (1974).

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