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Solar wind protons - Three-dimensional velocity distributions and derived plasma parameters measured between 0.3 and 1 AUSuch nonthermal features as temperature anisotropies, heat fluxes, and proton double streams have been observed by a Helios solar probe survey of solar wind three-dimensional proton velocity distributions between 0.3 and 1 AU. It is found that a strong anisotropy in the core of proton distributions, with a temperature that is larger perpendicular rather than parallel to the magnetic field, is a persistent feature of high-speed streams, becoming most pronounced in the perihelion, or about 0.3 AU. Isotropic distributions have been detected only close to, and at, magnetic sector boundaries, and the flattest radial temperature profiles are found in high-speed streams. These observations indicate that local heating or proton heat conduction occurs in the solar wind.
Document ID
19820036545
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Marsch, E.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Schwenn, R.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Rosenbauer, H.
(Max-Planck-Institut fuer Aeronomie Katlenburg, Germany)
Muehlhaeuser, K.-H.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Pilipp, W.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Neubauer, F. M.
(Braunschweig, Technische Universitaet Braunschweig, Germany)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Solar Physics
Accession Number
82A20080
Funding Number(s)
CONTRACT_GRANT: BMFT-WRS-0108
CONTRACT_GRANT: BMFT-WRS-10/7
Distribution Limits
Public
Copyright
Other

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