Observations and modeling of neutral gas releases from the APEX satellite

E. Y. Choueiri, V. N. Oraevsky, V. S. Dokukin, A. S. Volokitin, S. A. Pulinets, Y. Y. Ruzhin, V. V. Afonin

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Results from experiments of neutral xenon gas releases in the ionosphere are presented. The releases were made from the scientific satellite APEX, which had various plasma and field diagnostics. An enhancement of HF wave activity over a broad band (0.1-10 MHz) is shown to occur during releases made in the sunlight at high pitch angles to the magnetic field. No changes of plasma density were detected, but electron temperature measurements indicate electron energy enhancements during the releases. Theoretical calculations based on the conditions of the APEX releases show that charge-exchange collisions and elastic scattering of the injected Xe neutrals by the ambient plasma can lead to an ion beam instability that may account for the observed wave and electron energy enhancements. The interaction is akin to the critical ionization velocity effect. We calculate that because of the low injection density, this turbulence-fueled ionization should have a low yield (<1%), which may explain the lack of detectable plasma density enhancement.

Original languageEnglish (US)
Article number2001JA000040
Pages (from-to)25673-25681
Number of pages9
JournalJournal of Geophysical Research: Space Physics
Issue numberA11
StatePublished - Nov 1 2001

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography
  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)


Dive into the research topics of 'Observations and modeling of neutral gas releases from the APEX satellite'. Together they form a unique fingerprint.

Cite this