Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..476f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 476-486. Research sponsored by the Deutsche Forschun
Astronomy and Astrophysics
Astrophysics
14
Drag, Elastic Scattering, Heliosphere, Interstellar Matter, Plasma-Particle Interactions, Solar Wind, Boltzmann Transport Equation, Helium, Ionic Collisions, Mach Number
Scientific paper
It is shown that interactions of interstellar neutral helium atoms with solar wind ions via elastic collisions lead to non-negligible losses of both linear and angular particle momenta. This drag-like interaction with the solar wind plasma causes helium density increases in the helisophere compared with model densities derived with the conventional theory that considers drag-free motions of interstellar particles. The resulting density enhancements are particularly pronounced on the downwind side of the heliosphere, whereas on the upwind side the effect is small. The results obtained suggested that the interpretation of HeI-584 A resonance luminescence patterns of the cone region on the basis of conventional LISM theories gives rise to LISM helium temperatures that are at least 4000 K too high.
Fahr Hans Jörg
Nass H. U.
Ruciński Daniel
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