First-year continuous solar EUV irradiance from SOHO by the CELIAS/SEM during 1996 solar minimum

Details First-year continuous solar EUV irradiance from SOHO by the CELIAS/SEM during 1996 solar minimum First-year continuous solar EUV irradiance from SOHO by the CELIAS/SEM during 1996 solar minimum

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103....1o&link_type=abstract

Journal of Geophysical Research, vol. 10, p. 1

Physics

20

Solar Radiation, Soho Mission, Extreme Ultraviolet Radiation, Photodiodes, Solar Spectrometers, Emission Spectra, Irradiance, Photon Density, Solar Spectra, Data Bases, Line Spectra

Scientific paper

The CELIAS/SEM photodiode spectrometer aboard SOHO continuously monitors the full-disk EUV solar irradiance in an 8-nm wavelength band centered at 30.4 nm (first order) and in a broad wavelength band between 0.1 and 77 nm (central order). We present the absolute solar EUV irradiances for the 1996 solar EUV minimum year at 1 AU. The data show evidence of persistent solar EUV/soft X-ray active regions throughout this solar minimum period which give rise to both 27-day and short-term solar EUV irradiance variations. The lowest value of solar flux in the first order 30.4-nm band occurred on November 6, 1996, with a photon flux of 9.8 x 10 exp 9/sq cm/s. Using previously obtained solar spectra, we infer a photon flux of 4.7 x 10 exp 9/sq cm/s within a 1-nm bandpass centered on the solar He II 30.4 nm emission line at this time. The irradiance variation of the first-order channel was between +15 percent and -10 percent as measured from a smoothed quadratic least squares fit to the entire first-order channel database for 1996. The lowest central-order EUV photon flux occurred on the same day with an absolute flux of 2.2 x 10 exp 10/sq cm/s. When sharp increases of short-term flux variability are ignored, a variation between +45 percent and -30 percent from the smoothed least squares fit to the central-order database is obtained.

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