The color temperature of a sunspot penumbra

Details The color temperature of a sunspot penumbra The color temperature of a sunspot penumbra

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90....1l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Jan. 1984, p. 1-12.

Physics

2

Penumbras, Solar Prominences, Solar Spectra, Solar Temperature, Sunspots, Brightness Temperature, Continuous Spectra, Optical Thickness, Photosphere, Solar Instruments, Spectral Energy Distribution

Scientific paper

The new Multi-Diode Array and the recently modified Universal Birefringent Filter were used at the Vacuum Tower Telescope at the Sacramento Peak National Observatory to measure the continuum color temperature of a sunspot penumbra between 428.4 and 667.6 nm. The results show that the color temperatures within the penumbral structures closely follow a measure of the wavelength average of the brightness temperature. These observations suggest that, if the dark penumbral filaments overlie a normal quiet photosphere, they are opaque to the radiation from below.

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