The C I opacity and physical structure of cool, very dense plasma in the solar corona

Details The C I opacity and physical structure of cool, very dense plasma in the solar corona The C I opacity and physical structure of cool, very dense plasma in the solar corona

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..304f&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 304-314.

Astronomy and Astrophysics

Astronomy

12

Cold Plasmas, Dense Plasmas, Solar Corona, Spectroheliographs, Atmospheric Models, Lyman Alpha Radiation, Opacity, Oxygen Spectra, Ultraviolet Astronomy

Scientific paper

The physical structure of the cool material in the volume of the solar corona is investigated. The observational evidence is summarized in a table giving the brightness contrast in optical and EUV radiations. The state of ionization and the opacity sources are discussed, and a physical model is described that is consistent with the EUV and optical data. It is noted that a comparison of the EUV raster pictures with H-alpha and Ca K photoheliograms indicates that the material is commonly injected from below into relatively low-lying magnetic loops (fibrils) seen near sunspots and plages.

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