Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh12a1162f&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH12A-1162
Physics
7507 Chromosphere, 7509 Corona, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7549 Ultraviolet Emissions
Scientific paper
Studies of the solar UV (120--290~nm) spectral irradiance have shown that its variation correlates well with that of the core-to-wing ratio of the Mg~II compound absorption feature near 280~nm. The two chromospheric emission lines in the feature's core cause nearly all of the Mg~II index variation. The Mg~II index has also been shown to correlate with solar He~II emerging from the transition region. Although earlier studies appeared to show that an accurate representation of the solar Ly-α irradiance required the separation of the long- and short-term components of the Mg~II index, recently recalibrated measurements show that Ly-α also has a linear relationship with Mg~II. We analyze the solar spectral irradiance derived from SOHO EIT images roughly corresponding to coronal line emissions of Fe~IX/X, Fe~XII, and Fe~XV and find that the Mg~II index represents their variation more effectively than the more commonly used F10.7~cm flux. The long-term behavior of F10.7, Mg~II, and sunspot number are compared showing a strong divergence of the latter during the latter stages of the solar cycle~23 maximum.
Cook James
Floyd Linton
Herring Lynn
McMullin Don
Newmark Jeff
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