Bifurcation in the low chromosphere

Details Bifurcation in the low chromosphere Bifurcation in the low chromosphere

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..710a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 710-717.

Astronomy and Astrophysics

Astrophysics

18

Chromosphere, Extreme Ultraviolet Radiation, Faculae, Limb Darkening, Line Spectra, Solar Limb, Brightness Temperature, Carbon, Iron, Oxygen

Scientific paper

Bright chromospheric faculae of diameter d(c) covering an area of the solar disk f(c) smaller than 1 yield a predictable level of limb brightening. For a resolution diameter d(r), the combination of f(c) and d(c) leads, also, to a prediction of the fraction, phi(0), of observing pixels (resolution areas) that are free of facular emission. Data from the first flight of the High Resolution Telescope and Spectrograph of the U.S. Naval Research Laboratory with d(r) about 1 arcsec are used to measure both the level of limb brightening and phi(0) in EUV emission lines of O I, C I, and Fe II. The results favor f(c) about 0.9 and d(c) greater than about 2.5 arcssec. It is concluded that the chromospheric temperature rise is present over about 90 percent of the solar surface.

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