Broadening of the interplanetary helium cone structure due to elastic collisions of LISM helium atoms with solar wind ions

Details Broadening of the interplanetary helium cone structure due to elastic collisions of LISM helium atoms with solar wind ions Broadening of the interplanetary helium cone structure due to elastic collisions of LISM helium atoms with solar wind ions

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345...32f&link_type=abstract

In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 32-37 (SEE N85-15539 06-90)

Computer Science

2

Heliosphere, Helium, Interplanetary Medium, Interstellar Space, Solar Wind, Boltzmann Transport Equation, Elastic Scattering, Momentum Transfer, Particle Trajectories, Temperature Distribution

Scientific paper

Neutral interstellar particles penetrating into the heliosphere, besides being subject there to specific loss processes, suffer elastic collisions with KeV-solar wind ions. The momentum transfer to the neutrals connected with these collisions leads to a loss of angular momentum with respect to the Sun and to a fractional compensation of the effective solar gravity. The dynamical particle trajectories hence are changed into non-Keplerians leading to density and temperature distributions differing from those calculated in the past. This is found from a solution of the Boltzmann equation that linearizes the effect of this additional force. It is shown that the HeI-584A resonance glow of the heliospheric helium cone lead to substantially lower interstellar helium temperatures if re-interpreted on the basis of this revised theory. These temperatures now seem to be in accordance with the derived temperatures for interstellar hydrogen.

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