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Solar EUV measurements at Venus based on photoelectron emission from the Pioneer Venus Langmuir probeData from the Pioneer Venus Langmuir probe, collected since 1979 (and thus, including the period between solar maximum in 1979-1980 and solar minimum in 1986-1987) are examined. Calculations show that about 51 percent of the solar emission at Venus is due to Lyman alpha (1216 A), 46 percent is produced by wavelengths between 550 and 1100 A, and less than 3 percent is due to wavelengths longer than Lyman alpha. The photocurrents were found to exhibit variations related to the solar cycle and solar rotation, as well as a major 7.2-month periodicity. Three different indices of solar EUV behavior at Venus were derived, which include the photoemission current itself, the total EUV flux, and an F(10.7)-like solar index, and are compared with related measurements made simultaneously at earth.
Document ID
19880059406
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Brace, L. H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hoegy, W. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Theis, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1988
Publication Information
Publication: Journal of Geophysical Research
Volume: 93
ISSN: 0148-0227
Subject Category
Solar Physics
Accession Number
88A46633
Distribution Limits
Public
Copyright
Other

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