The radial evolution of a single solar wind plasma parcel

Details The radial evolution of a single solar wind plasma parcel The radial evolution of a single solar wind plasma parcel

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9919s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 9919-9932. Research supported by the Nuffield Founda

Physics

27

Radial Velocity, Solar Physics, Solar Wind Velocity, Adiabatic Conditions, Energy Distribution, Ionic Mobility, Magnetohydrodynamic Stability, Plasma Composition, Plasma Heating, Plasma Temperature, Solar Magnetic Field

Scientific paper

A study has been made of one of the rare occasions when the same piece of solar wind plasma passed both Helios 1 (at 0.507 AU) and Helios 2 (at 0.72 AU). The particular example occurred in the middle of a fairly smooth and typical high-speed stream. Clear indications are found that the ion behavior during this transit did not conserve the particles' adiabatic invariants and that some heating is required for the proton and alpha perpendicular temperature. The situation regarding the parallel temperature is less clear. The decreasing alpha-proton differential speed does not appear to release very much free energy owing to a natural 'adiabatic' cooling process. A very strong radial dependence of the electromagnetic energy flux, along with other factors, suggests the possibility of strong dissipation of Alfvenic fluctuations. The conclusions of the study are weakened somewhat by the many sources of inaccuracy that have been found and that seem unavoidable in a study of this kind.

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