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The Energy Spectrum of Jovian Electrons in Interplanetary SpaceThe energy spectrum of electrons with energies approx 10 to approx 180 MeV measured with the electron telescope on the Voyager 1 and 2 spacecraft in interplanetary space from 1978 to 1983 is studied. The kinetic energy of electrons is determined by double dE/dx measurements from the first two detectors (D sub 1, D sub 2) of a stack of eight solid state detectors and by the range of particle penetration into the remaining six detectors (D sub 3 to D sub 8) which are interleaved with tungsten absorbers. From 1978 to 1983 (radial range approximately 2 to a pproximately 12 AU) electrons of Jovian origin were clearly observable for electrons stopping in D(sub 3(E approximately greater than 4 MeV)) and in D(sub 4 (E approximately greater than 8 MeV)). For electrons stopping in D(sub 5(E approximately greather than 12 MeV)), the jovian flux dominated the galactic electron flux for a period of approximately one year near the encounter with Jupiter. Jovian electrons were also observed in D(sub 6(E approximately greater than 21 MeV)) but not in D(sub 7(E approximately greater than 28 MeV)). A detailed interpretation of the electron variations in all energy channels depends on an accurate subtraction of background induced by energetic protons of a few 100 MeV. This substraction is facilitated by laboratory calibration results at several energies. Further results on the differential energy spectrum of Jovian electrons and limits on the maximum detected energies will be reported.
Document ID
19850026468
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Christon, S. P. (California Inst. of Tech. Pasadena, CA, United States)
Cummings, A. C. (California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C. (California Inst. of Tech. Pasadena, CA, United States)
Webber, W. R. (New Hampshire Univ.)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 4
Subject Category
Space Radiation
Report/Patent Number
SH-1.5-18
Accession Number
85N34781
Funding Number(s)
CONTRACT_GRANT: NAS7-918
CONTRACT_GRANT: NGR-05-002-160
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850026416Collected WorksNinteenth International Cosmic Ray Conference. SH Sessions, Volume 4
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