Variation of the solar He I 1830 A line: 1977 - 1980

Details Variation of the solar He I 1830 A line: 1977 - 1980 Variation of the solar He I 1830 A line: 1977 - 1980

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981vsc..conf..265h&link_type=abstract

In NASA. Goddard Space Flight Center Variations of the Solar Constant p 265-272 (SEE N82-17014 07-92)

Physics

4

Coronas, H Lines, Solar Activity, Solar Constant, Solar Rotation, Solar Spectra, Variations, Calcium, Emission Spectra, Helium, Luminosity, Solar Physics, Stellar Spectra

Scientific paper

Daily measurements of the equivalent width of the 10830 A He I line integrated over the visible disk show: (1) an increase from about 32 to about 74 mA in the monthly mean values from the minimum to the maximum of the current solar cycle; (2) the monthly mean values are more smoothly varying than most other indices of solar activity; (3) rotation modulates the daily values in a highly variable manner with amplitudes as large as plus or minus 20%; (4) the apparent synodic rotation period is 29 days rather than the expected 27 days associated with active regions; (5) despite great differences in the appearance of the sun in 3933 A Ca I and 10830 A He I, the central intensity of the former correlates with the equivalent width of the latter with a value r = 0.97.

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