Stochastic scattering and other contributions to the sun's wake in the local hydrogen cloud

Details Stochastic scattering and other contributions to the sun's wake in the local hydrogen cloud Stochastic scattering and other contributions to the sun's wake in the local hydrogen cloud

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976cemec..13...65w&link_type=abstract

Celestial Mechanics, vol. 13, Feb. 1976, p. 65-74. Research supported by the Science Research Council of England.

Computer Science

2

Atomic Collisions, Elastic Scattering, Hydrogen Clouds, Lyman Alpha Radiation, Solar Protons, Background Radiation, Collision Parameters, Hydrogen Atoms, Particle Collisions, Particle Interactions, Particle Trajectories, Scattering Cross Sections, Solar Wind, Stochastic Processes

Scientific paper

Gas streaming through the solar system experiences both destructive and scattering processes, the latter primarily in collisional interactions with solar-wind protons. The scattering interactions can be important in filling the downstream wake and may effectively increase the velocity dispersion as well as cause discrete orbit changes. The downstream intensity moment is evaluated analytically for particles suffering a single discrete collision, and is compared with the moment from a thermal velocity dispersion (both in the absence of a central force field). The elastic-scattering collisions of protons in H-gas lead to a contribution to the Ly-alpha backscatter from the wake equivalent to an initial thermal velocity of about 1 km/s. This exceeds the contribution due to focussing in the solar gravitational field, provided the radiation pressure is not less than 0.8 times the gravitational attraction.

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