Space Science Reviews

, Volume 97, Issue 1–4, pp 413–416 | Cite as

Heliospheric ENA fluxes: How Sensitive Are They to the Ionization State of LIC?

  • Vlad Izmodenov
  • Mike Gruntman
  • Vladimir Baranov
  • Hans Fahr


We explore the sensitivity of the fluxes of heliospheric energetic neutral atoms (ENA) at 1 AU to the ionization state of the local interstellar cloud (LIC). The solar wind plasma is compressed and heated in the termination shock transition. The shocked solar plasma is convected toward the heliospheric tail in the heliosheath, the region between the termination shock and the heliopause. The ENAs are produced in charge exchange of the plasma protons and background neutral gas and can be readily detected at 1 AU. The expected ENA fluxes depend on the shocked plasma density, temperature, and velocity in the heliosheath. The size and structure of the heliospheric interface region depend on the parameters of the interstellar medium. ENA fluxes would thus reveal the LIC parameters. We demonstrate the sensitivity of the heliospheric ENA fluxes to the ionization state of the LIC. The axi-symmetric model of the solar wind/LIC interaction includes the self-consistent treatment of the plasma-gas coupling and Monte Carlo simulations of the neutral gas distribution.


Solar Wind Charge Exchange Termination Shock Solar Wind Plasma Solar Wind Proton 
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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Vlad Izmodenov
    • 1
  • Mike Gruntman
    • 2
  • Vladimir Baranov
    • 3
  • Hans Fahr
    • 4
  1. 1.Department of Aeromechanics, Faculty of Mechanics and MathematicsMoscow State UinversityMoscowRussia
  2. 2.University of Southern CaliforniaLos AngelesU.S.A.
  3. 3.Institute for Problems in MechanicsRussian Academy of SciencesMoscowRussia
  4. 4.Institut fur AstrophysikUniversitat BonnGermany

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