Stochastic and dynamic temperature changes in the interplanetary gas

Details Stochastic and dynamic temperature changes in the interplanetary gas Stochastic and dynamic temperature changes in the interplanetary gas

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..111w&link_type=abstract

Planetary and Space Science, vol. 26, Feb. 1978, p. 111-120. Research supported by the Science Research Council of England.

Physics

6

Fokker-Planck Equation, Gas Temperature, Interplanetary Gas, Particle Collisions, Solar Wind, Stochastic Processes, Background Radiation, Collision Parameters, Distribution Functions, Doppler Effect, Dynamic Characteristics, Field Theory (Physics), Sky Radiation, Velocity Distribution

Scientific paper

The paper presents exact solutions to the Fokker-Planck equations, incorporating stochastic velocity changes and modelling particles moving in an inverse square central force field under an inverse square collision frequency. The solutions for the velocity distribution contain a combination of collisional and dynamical (reversible) heating. Topics discussed include solution on upstream axis, distribution over radial velocities, and solution on the downstream axis. Collisional heating is considered, and the temperature range for interplanetary helium gas reaching 1 a.u. is described. In interpreting 584-A sky background radiation observations, the dynamical changes in the velocity spread have to be taken into account for helium gas that is initially hot, when Doppler shifts relative to the solar emission line are significant. Since the present solutions are thermal approximations to the distribution function they reveal the appropriate radial temperature as a function of space.

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