The MgII core-to-wing ratio: An update of the multi-satellite composite index

Details The MgII core-to-wing ratio: An update of the multi-satellite composite index The MgII core-to-wing ratio: An update of the multi-satellite composite index

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa31a..06v&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA31A-06

Physics

0300 Atmospheric Composition And Structure, 1241 Satellite Orbits, 1650 Solar Variability

Scientific paper

Solar EUV variability is one of the dominant drivers of variability in thermospheric density and satellite drag. Until recently, those who monitor and predict satellite orbits have had to rely on proxies for the solar EUV flux because actual solar EUV observations have not been timely enough or have not been available. It has been shown that the Mg II Index is an excellent proxy for the solar EUV flux. While overlapping Mg II index data sets from different instruments give a consistent representation of solar EUV flux, differences in absolute value and sensitivity must be resolved to create a single continuous data set. We recently re-examined the various Mg II core-to-wing ratios from the SBUV, SUSIM, SOLSTICE, and GOME instruments in an attempt to create the best possible composite Mg II Index. The details of how this new composite Mg II Index was constructed will be presented. Features of the various data sets will be compared and the final complete Mg II Index from 1978 to the present will be shown. In addition, the real-time daily values of the Mg II index from the NOAA-16 SBUV/2 have been scaled to this index and the application of this data to the SOLAR2000 empirical solar irradiance model (Tobiska et al., 2000) will be described.

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