The connection between coronal bright points and the variability of the quiet-sun extreme-ultraviolet emission

Details The connection between coronal bright points and the variability of the quiet-sun extreme-ultraviolet emission The connection between coronal bright points and the variability of the quiet-sun extreme-ultraviolet emission

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..667h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 667-676.

Astronomy and Astrophysics

Astrophysics

14

Coronal Holes, Extreme Ultraviolet Radiation, Solar Activity, Ultraviolet Emission, Variability, Chromosphere, Solar Atmosphere, Spatial Distribution, Temperature Distribution

Scientific paper

An analysis of the EUV/Skylab data recorded at six wavelengths simultaneously and scanning the chromosphere to the corona is reported. The results show that, whether in a coronal hole or a quiet region, the significant variable emission in the quiet sun is preferentially localized in the enhanced emission produced by EUV bright points in the boundaries of network cells. The spatial density of the variable and enhanced emission varies with temperature, with a minimum at 3 x 10 exp 5 K which indicates two favored temperature distributions of small-scale loops in the quiet sun, one below 3 x 10 exp 5 K and one at coronal temperatures. The enhanced emission occupies between 10 and 25 percent of the solar surface, depending on the temperature, while the variable emission covers between 5 and 15 percent. For a given region, the spatial density at a given temperature does not vary in time by more than 10 percent about its mean value.

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