Estimation of the solar Lyman alpha flux from ground based measurements of the CA II K line

Details Estimation of the solar Lyman alpha flux from ground based measurements of the CA II K line Estimation of the solar Lyman alpha flux from ground based measurements of the CA II K line

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..575r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 575-578.

Other

17

K Lines, Lyman Alpha Radiation, Solar Cycles, Solar Flux, Solar Spectra, Annual Variations, Calcium, Metallicity, Solar Activity, Solar Mesosphere Explorer

Scientific paper

Measurements of the solar Lyman alpha and Ca II K from October 1981 to April 1989 show a strong correlation (r = 0.95) that allows estimation of the Lyman alpha flux at 1 AU from 1975 to December 1989. The estimated Lyman alpha strength of 3.9 x 10 to the 11th + or - 0.15 x 10 to the 11th photons/s sq cm on December 7, 1989 is at the same maximum levels seen in Cycle 21. Relative to other UV surrogates (sunspot number, 10.7 cm radio flux, and He I 10830 line strength), Lyman alpha estimates computed from the K line track the SME measurements well from solar maximum, through solar minimum, and into Cycle 22.

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