The solar Ca II K index and the Mg II core-to-wing ratio |
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| Authors: | R F Donnelly O R White W C Livingston |
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| Institution: | (1) Space Environment Lab., NOAA ERL, 80303 Boulder, CO, USA;(2) High Altitude Observatory, NCAR, 80307 Boulder, CO, USA;(3) National Solar Observatory, NOAO, 85726 Tucson, AZ, USA |
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| Abstract: | The 1  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 andr = 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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