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Judge, D.L.; McMullin, D.R.; Ogawa, H.S.; Hovestadt, D.; Klecker, B.; Hilchenbach, M.; Mobius,
E.; Canfield, L.R.; Vest, R.E.; Watts, R.; Tarrio, C.; Kuhne, M.; Wurz, P.
First solar EUV irradiances obtained from SOHO by the CELIAS/SEM
Sol. Phys. (Netherlands), Solar Physics
(Jan. 1998), vol.177, no.1-2 p. 161-73
The first results obtained with the Solar EUV Monitor (SEM), part of the Charge, Element, and
Isotope Analysis System (CELIAS) instrument, aboard the Solar and Heliospheric Observatory
(SOHO) satellite are presented. The instrument monitors the full-disk absolute value of the solar
He II irradiance at 30.4 nm, and the full-disk absolute solar irradiance integrated between 0.1 nm
and 77 nm. The SEM was first turned on December 15, 1995 and obtained first light' on
December 16, 1995. At this time the SOHO spacecraft was close to the L-1 Lagrange point,
1.5*10/sup 6/ km from the Earth towards the Sun. The data obtained by the SEM during the first
four and a half months of operation are presented. Although the period of observation is near solar
minimum, the SEM data reveal strong short-term solar irradiance variations in the broad-band,
central image channel, which includes solar X-ray emissions.
Conference Paper; Journal Paper