Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..428..315m&link_type=abstract
SOHO-23: Understanding a Peculiar Solar Minimum ASP Conference Series Vol. 428, proceedings of a workshop held 21-25 September 2
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Using a solar spectral irradiance model which estimates the spectrum in an 18 nm region around the Mg II h and k lines at 280 nm we have estimated the Mg II index. This model uses observed active region, quiet Sun, and sunspot spectra as well as center-to-limb variation results from the HRTS-9 rocket as empirical inputs. To determine the location of these features on a given day, the model uses Ca II K images. This paper presents preliminary estimates of the Mg II index during the 1961 to 1981 time period and compares these values to those determined from observations from 1978 to present.
Floyd Linton
McMullin Don
Morrill Jeff S.
Snow Martin
Viereck Rodney
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