The Coarse Structure of the Solar Atmosphere

Details The Coarse Structure of the Solar Atmosphere The Coarse Structure of the Solar Atmosphere

Oct 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969soph....9..317s&link_type=abstract

Solar Physics, Volume 9, Issue 2, pp.317-327

Physics

48

Scientific paper

Observations of the quiet sun at wavelengths from 3 Å to 75 cm show (with two exceptions: the Ovi line at 1032 Å and possibly the continuum at 1.2 mm) either no limb brightening or less than had been supposed. On the other hand, the brightness temperature is observed to increase with wavelength in the millimeter and centimeter range. If this increase is due to greater visibility of hot overlying material, that material ought to be evident at the limb at shorter wavelengths, resulting in limb brightening. The only possible explanation for the absence of limb brightening at almost all wavelengths is that the emitting surface is rough at all wavelengths, with a scale of roughness approximately equal to the scale height at each temperature. Contradictions with existing models, along with the additional observations required for an improved model are discussed.

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