Abstract
ABSTRACT 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 magnestis m. To reduce the chromospheric emission to levels for G-type stars showing no chromospheric activity cycles, no 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% 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 non-cycling state.
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