Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..419w&link_type=abstract
Planetary and Space Science, vol. 23, Mar. 1975, p. 419-430. Research supported by the Science Research Council of England.
Astronomy and Astrophysics
Astronomy
21
Elastic Scattering, Fokker-Planck Equation, Interplanetary Gas, Interstellar Gas, Plasma Heating, Solar Wind, Astronomical Models, Backscattering, Boltzmann Transport Equation, Gas Streams, Gravitational Effects, Helium, Ionizing Radiation, Particle Collisions, Resonance Scattering
Scientific paper
Interstellar gas streaming through the solar system undergoes both elastic collisions with solar wind ions and destructive, ionizing processes. The Boltzmann equation is set up, with linear Fokker-Planck terms describing the glancing elastic collisions. Solutions combining the dynamical effects of the central force field and the diffusion in velocity space are derived appropriate to cool gas. For the He component of the streaming gas, if initially at 100 K, the collisional heating dominates inside 2 a.u. upstream and 5 a.u. downstream. A modified formula is given for the density in the downstream wake, as enhanced by gravitational focussing. Calculations of the helium resonant radiation backscatter require substantial modification.
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