The sun in a noncycling state

Details The sun in a noncycling state The sun in a noncycling state

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1139w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 682, p. 1139-1143.

Astronomy and Astrophysics

Astronomy

45

Chromosphere, Solar Atmosphere, Solar Cycles, Metallicity, Solar Activity, Solar Magnetic Field

Scientific paper

Using the Baliunas and Jastrow (1990) study of cyclic variability in solar-type stars, we transform existing solar data to the stellar HK irradiance scale and examine the state of the solar chromosphere when a solar-type star shows little cyclic variability and surface magnetism. To reduce the chromospheric emission to levels for G-type stars showing no chromospheric activity cycles, not only must the sun be free of plages and network; the brightness of the quiet chromosphere in the K line must be reduced to levels seen only in 15 percent of the quiet sun area today. In contrast, the present-day level of K emission from the sun places it in the class of most active solar-type stars, far removed from a noncycling state.

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