Hot Neutral H in the Heliosphere: Elastic H-H, H-p Collisions

Details Hot Neutral H in the Heliosphere: Elastic H-H, H-p Collisions Hot Neutral H in the Heliosphere: Elastic H-H, H-p Collisions

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ap%26ss.274...71i&link_type=abstract

Astrophysics and Space Science, v. 274, Issue 1/2, p. 71-76 (2000).

Astronomy and Astrophysics

Astrophysics

17

Scientific paper

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.

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