Verification of SOHO/CELIAS/SEM EUV Flux Calibration Based on Seven Sounding Rocket Flights

Details Verification of SOHO/CELIAS/SEM EUV Flux Calibration Based on Seven Sounding Rocket Flights Verification of SOHO/CELIAS/SEM EUV Flux Calibration Based on Seven Sounding Rocket Flights

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1807d&link_type=abstract

American Astronomical Society, SPD meeting #40, #18.07; Bulletin of the American Astronomical Society, Vol. 41, p.845

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A verified and updated version of the calibrated SOHO/CELIAS/SEM (absolute) solar extreme ultraviolet (EUV) measurements from the beginning of the mission in 1996 through the present is available
at the University of Southern California Space Sciences Center website (www.usc.edu/dept/space_science).
To complete this new version, seven (1996- 2006) sounding rocket under-flights were analyzed using measurements from both a very stable Rare Gas (Ne) Ionization Cell (RGIC) and a clone of
the flight SEM instrument. These sounding rocket under-flights have provided a number of reference points that have been compared with the solar flux data published on our web site (last revised
in 2000). These reference points are in good agreement with the solar cycle EUV flux for the 30.4 nm first order (26 nm to 34 nm) SEM channels, indicating a very small (less than 1 percent)
averaged difference from the best revised published flux for the seven under- flights.
After providing thirteen years of accurate and near continuous data (with the exception of the SOHO "vacation"),
SEM continues to give important information about short term (solar flares) and long
term (solar cycle) changes of EUV solar irradiance. These data are useful for advancing solar models, for more accurate Earth atmosphere drag models, ionization proxies, and atmospheric dynamics generally,
and will also provide solar EUV measurement overlap with the new SDO Extreme ultraviolet Variability Experiment (EVE), to be launched in 2009. This work was supported by NASA grants NNG05WC09G and NNX08AM94G.

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