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The quiet-time low energy nucleon spectrum in the vicinity of earthObservations of the low energy quiet-time interplanetary nucleon spectrum obtained by Explorer 47 are examined for March 9-12, 1973, the quietest period from Sept. 26, 1972 through Feb. 15, 1975. The quiet-time energy spectrum may be represented by a power law with an index of about -3.1. The H/He ratio below 2 MeV is about 10. The ratio of antisunward to sunward intensities is about 2.6, increasing to about 8.55 in a frame moving with the solar wind. The angular distributions show that in the 0.3-0.5 MeV range most of the proton intensity originates in the earth's magnetosphere. The spectral behavior and enhancement of proton counting rates during microbursts suggest that the magnetosphere is a significant source at energies up to 2 MeV. The observed intensities are lower than those reported by Simpson and Tuzzolino (1973) by factors of 3 to 10. It is suggested that the low energy upturn in the quiet-time interplanetary proton spectrum may be related to particle emissions from planetary magnetospheres, such as that of Jupiter.
Document ID
19760043925
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Krimigis, S. M.
(Johns Hopkins Univ. Laurel, MD, United States)
Kohl, J. W.
(Johns Hopkins University Laurel, Md., United States)
Armstrong, T. P.
(Kansas, University Lawrence, Kan., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Space Radiation
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Munich
Start Date: August 15, 1975
End Date: August 29, 1975
Accession Number
76A26891
Funding Number(s)
CONTRACT_GRANT: N00017-72-C-4401
CONTRACT_GRANT: NASA TASK I
Distribution Limits
Public
Copyright
Other

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