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Absolute measurement of the extreme UV solar fluxA windowless rare-gas ionization chamber has been developed to measure the absolute value of the solar extreme UV flux in the 50-575-A region. Successful results were obtained on a solar-pointing sounding rocket. The ionization chamber, operated in total absorption, is an inherently stable absolute detector of ionizing UV radiation and was designed to be independent of effects from secondary ionization and gas effusion. The net error of the measurement is + or - 7.3 percent, which is primarily due to residual outgassing in the instrument, other errors such as multiple ionization, photoelectron collection, and extrapolation to the zero atmospheric optical depth being small in comparison. For the day of the flight, Aug. 10, 1982, the solar irradiance (50-575 A), normalized to unit solar distance, was found to be 5.71 + or - 0.42 x 10 to the 10th photons per sq cm sec.
Document ID
Document Type
Reprint (Version printed in journal)
Carlson, R. W.
(California Institute of Technology, Jet Propulsion Laboratory, Earth and Space Science Div., Pasadena CA, United States)
Ogawa, H. S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Judge, D. L.
(Southern California, University Los Angeles, CA, United States)
Phillips, E.
(Litton Industries Woodland Hills, CA, United States)
Date Acquired
August 12, 2013
Publication Date
July 15, 1984
Publication Information
Publication: Applied Optics
Volume: 23
ISSN: 0003-6935
Subject Category
Solar Physics
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