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Astrophysics and Space Science

, Volume 274, Issue 1–2, pp 71–76 | Cite as

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

  • Vladislav V. Izmodenov
  • Yury G. Malama
  • Alexandr P. Kalinin
  • Mike Gruntman
  • Rosine Lallement
  • Irina P. Rodionova
Article

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.

Keywords

Solar Wind Charge Exchange Momentum Transfer Atom Population Momentum Transfer Cross Section 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Vladislav V. Izmodenov
    • 1
  • Yury G. Malama
    • 2
  • Alexandr P. Kalinin
    • 2
  • Mike Gruntman
    • 3
  • Rosine Lallement
    • 4
  • Irina P. Rodionova
    • 5
  1. 1.Lomonosov Moscow State UniversityRussia
  2. 2.Institute for Problems in MechanicsMoscowRussia
  3. 3.Depart. Aerospace Engin.Univ. Southern California
  4. 4.Service d'Aeronomie, CRNSFrance
  5. 5.Semenov Institute for Chemical PhysicsMoscowRussia

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