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  • 1990-1994  (1)
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    Electronic Resource
    Electronic Resource
    The solar Ca II K index and the Mg II core-to-wing ratio (1994)
    Springer
    Solar physics 152 (1994), S. 69-76 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 1 Å 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473185
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