On the collisional relaxation of solar wind velocity distributions

Details On the collisional relaxation of solar wind velocity distributions On the collisional relaxation of solar wind velocity distributions

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..333l&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, Oct. 1986, p. 333-340.

Mathematics

2

Coulomb Collisions, Fokker-Planck Equation, Solar Wind Velocity, Velocity Distribution, Distribution Functions, Operators (Mathematics), Relaxation Time, Temperature Ratio, Temporal Distribution

Scientific paper

The time-evolution of two non-Maxwellian distribution functions under the effects of Coulomb self-collisions is investigated. The full Fokker-Planck collision operator is employed, which describes binary particle interactions resulting in small-angle deflections of particle trajectories. Emphasis is placed on a detailed analysis of the temporal evolution of an appropriate effective collision frequency, which is formally defined by a relaxation-time version of the collision operator. The time required for the distribution to become Maxwellian is found to be nearly ten times the self-collision time. The collisional evolution of the higher moments of the distributions is also discussed.

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