The relationship between solar activity and the H and K line cores in integrated sunlight

Details The relationship between solar activity and the H and K line cores in integrated sunlight The relationship between solar activity and the H and K line cores in integrated sunlight

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..309j&link_type=abstract

Solar Physics, vol. 57, Apr. 1978, p. 309-318. NSF-supported research.

Astronomy and Astrophysics

Astronomy

4

H Lines, K Lines, Solar Activity, Solar Spectra, Ultraviolet Spectra, Electrophotometers, Faculae, Spectrum Analysis, Stellar Spectrophotometry, Ultraviolet Astronomy

Scientific paper

Photoelectric measurements of the Ca II H and K lines in the spectrum of integrated sunlight, which are free of scattered light and referred to spectral intensities at well-defined nearby continuum wavelengths, are used to study the behavior of the H- and K-line cores in the sun. The data were either collected on 18 days during a solar rotation or previously recorded as part of an atlas of the spectrum of integrated sunlight between 3900 and 6000 A. The features discussed ('line-core components') include the H and K central absorption cores as well as the four emission features located immediately longward and shortward of the central absorption cores. A correlation is derived between the H- and K-line core intensities and two indices of solar activity: the Ca II plage index calculated by Swartz and Overbeek (1971) and the 2800-MHz flux. Line-core intensities, some intensity ratios, and the Wilson-Bappu emission width are determined, and the errors and uncertainties of the analysis are briefly examined. The results are shown to confirm that there is a variation with solar activity in the intensities of the Ca II H- and K-line cores; the correlations are found to lie in the range from 0.40 to 0.81.

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