Spectroscopic observations and models of umbral light bridges

Details Spectroscopic observations and models of umbral light bridges Spectroscopic observations and models of umbral light bridges

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124...37s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 124, no. 1, 1989, p. 37-52.

Physics

12

Astronomical Spectroscopy, Solar Atmosphere, Solar Spectra, Spectrum Analysis, Sunspots, Umbras, Atmospheric Models, Line Spectra, Penumbras, Sodium, Stellar Models

Scientific paper

Profiles of the Na I D lines in two moderately bright umbral light bridges are analyzed. A simple method of elimination of stray light is presented. The corrected continuum intensities (lambda = 588 nm) of the light bridges are 0.51 and 0.43. For each light bridge, an optimization technique is used to derive a semiempirical model. The models exhibit a steep temperature rise towards the subphotospheric layers. Generally, the temperature of the light bridges under investigation is lower than the temperature of the penumbra as well as the temperature of bright umbral dots.

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