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Energies of backstreaming protons in the foreshockAt least some part of the cislunar solar wind region outside the earth's bow shock is continuously populated by particles and waves of shock or magnetospheric origin. The varying precursor region, or foreshock, is divided into several subregions, not all geometrically distinct, which are defined by differing particle species and wavemodes. A first-order examination is presented of the way in which the geometry of the foreshock wave boundary of Diodato et al. (1976) can be translated into a geometry of return proton energies. A predicted pattern of energy versus detector location in the cislunar region is displayed for proton guiding-centers traveling upstream away from the quasi-parallel bow shock. Only the simplest case of gyrationless particles is considered. Important contributors to the spread in energies to be expected of ions coming from each segment are discussed. The actual pattern of return particles will be somewhat different from the idealized one discussed, because foreshock boundary-protons will be neither unidirectional nor monoenergetic.
Document ID
19760062495
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenstadt, E. W.
(TRW Defense and Space Systems Group Redondo Beach, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1976
Publication Information
Publication: Geophysical Research Letters
Volume: 3
Subject Category
Geophysics
Accession Number
76A45461
Funding Number(s)
CONTRACT_GRANT: NASW-2877
Distribution Limits
Public
Copyright
Other

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