Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.311...87c&link_type=abstract
Joint Varenna-Abastumani-ESA-Nagoya-Potsdam Workshop on Plasma Astrophysics, p. 87 - 92
Astronomy and Astrophysics
Astrophysics
Space Vehicles: Plasma Waves, Space Vehicles: Earth Ionosphere, Space Vehicles: Earth Magnetosphere
Scientific paper
Water molecules outgassed from the US/NASA space shuttle suffer collisional charge-exchange with ionospheric oxygen ions, thereby forming unstable distributions of pick-up water ions and leading to high levels of plasma waves near the shuttle. Liouville's equation with a charge-exchange source term is solved for the water ion distribution function as a function of position relative to the shuttle. The observational characteristics of the near zone shuttle waves are summarized. A linear theory in which beam-like distributions of water ions drive Doppler-shifted lower hybrid waves via the modified-two-stream instability is developed. This theory explains many characteristics of the near zone waves. However, further work on the effects of wave nonlinearities and spatial inhomogeneity is required to explain the detailed frequency spectrum of the waves. The observed wave levels apparently satisfy the threshold condition for modulational instability of lower hybrid waves.
Cairns Iver H.
Gurnett Donald A.
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