The effect of binary encounters on the thermal anisotropy of the protons in the solar wind

Details The effect of binary encounters on the thermal anisotropy of the protons in the solar wind The effect of binary encounters on the thermal anisotropy of the protons in the solar wind

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44..107e&link_type=abstract

Astronomy and Astrophysics, vol. 44, no. 1, Nov. 1975, p. 107-112.

Astronomy and Astrophysics

Astrophysics

3

Anisotropy, Proton Flux Density, Proton-Proton Reactions, Solar Protons, Solar Wind, Astronomical Models, Interplanetary Magnetic Fields, Kinetic Energy, Plasma Temperature

Scientific paper

The thermal anisotropy is investigated theoretically under conditions where the expansion is both steady-state and adiabatic, and the interplanetary magnetic field is radial. It is assumed further that binary encounters between protons constitute the sole mechanism of limiting the value of the temperature-anisotropy factor K (the ratio of the kinetic temperature in the radial direction to the kinetic temperature in the transverse direction). Two solutions are derived. In the first, the anisotropy factor is expressed analytically in terms of the local flow parameters. The second solution, which serves as a check on the first, gives the anisotropy factor as a function of heliocentric distance. A notable result emerges from the analysis. If the value of K at the heliocentric distance r is less than 4, K is larger as the sun is approached but does not exceed 4. If the value of K at r is greater than 4, K is smaller closer to the sun but not less than 4.

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