The solar CA II K index and the MG II core-to-wing ratio

Details The solar CA II K index and the MG II core-to-wing ratio The solar CA II K index and the MG II core-to-wing ratio

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..152...69d&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 152, no. 1, p. 69-76

Physics

23

Calcium, H Lines, K Lines, Line Shape, Magnesium, Solar Radiation, Nimbus 7 Satellite, Noaa 9 Satellite, Solar Cycles

Scientific paper

The 1A index of the solar Ca II K line is compared with the core-to-wing ratio of satellite measurements of the Mg II h and k lines. The correlation coefficient r = 0.976 for the Nimbus-7 Mg II ratio during solar cycle 21 and r = 0.99 for the NOAA9 Mg II ratio in cycle 22. Linear regression analysis for the full dynamic range of both data sets is used to combine the Nimbus-7 and NOAA9 Mg II data. These relations permit the ground-based Ca K index to estimate the solar UV flux.

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