The Evershed effect in penumbral fine structures. 1: Height dependence of velocity fluctuations

Details The Evershed effect in penumbral fine structures. 1: Height dependence of velocity fluctuations The Evershed effect in penumbral fine structures. 1: Height dependence of velocity fluctuations

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..620d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 620-624

Astronomy and Astrophysics

Astrophysics

19

Fine Structure, Height, Line Spectra, Penumbras, Sunspots, Velocity Distribution, Brightness Distribution, Continuum Flow, Power Spectra, Solar Granulation, Solar Spectra

Scientific paper

A number of spectral lines with negligible Zeeman splitting have been used for a spectroscopic observation of sunspot penumbrae at different slit positions and heliocentric angles: Fe I 5576 simultaneously with Si I 6145, and, separately, Fe I 5434 and Ni 5435 simultaneously with Ni I 4912. The formation levels of cores and wings at 20% depression were determined from contribution functions to the line depression. The spatial fluctuations of the continua, the residual line intensities, and the Doppler shifts of cores and wings are separated from a mean penumbral variation. A power spectrum analysis shows that the typical fluctuations increases with height. The root-mean-square (rms) velocity fluctuations decrease with height, resembling the known granular behaviour. The coincidence of a coarser spatial intensity and velocity structure and smaller velocities at higher levels favour an explanation by a height dependent filling.

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