Hot Neutral H in the Heliosphere: Elastic H-H, H-p Collisions |
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| Authors: | Vladislav V Izmodenov Yury G Malama Alexandr P Kalinin Mike Gruntman Rosine Lallement Irina P Rodionova |
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| Institution: | (1) Lomonosov Moscow State University, Russia;(2) Institute for Problems in Mechanics, Moscow, Russia;(3) Depart. Aerospace Engin., Univ. Southern California, Los Angeles;(4) Service d'Aeronomie, CRNS, France;(5) Semenov Institute for Chemical Physics, Moscow, Russia |
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| Abstract: | Williams et al. (1997) have suggested that a population of hot hydrogen atoms is created in the heliosphere through elastic H-H collisions
between energetic `solar' atoms (neutralized solar wind) and interstellar atoms. They used a BGK-like approximation (Bhatnagar
et al., 1954) for the Boltzmann collision term and the collision cross sections suggested by Dalgarno (1960). We show that both
assumptions result in a significant overestimation of the the H-H collision effect. On the basis of calculated momentum transfer
cross-sections for elastic H-H collisions, we argue that elastic H-H and H-p collisions cannot produce hot H atoms in the
heliosphere.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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