Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23a2038s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM23A-2038
Physics
Plasma Physics
[7800] Space Plasma Physics, [7831] Space Plasma Physics / Laboratory Studies And Experimental Techniques, [7855] Space Plasma Physics / Spacecraft Sheaths, Wakes, Charging
Scientific paper
Sheaths occur on interfaces between plasmas and solid bodies such as spacecraft. Sheath potential structures are assumed to be stable but there are many exceptions where sheaths become unstable. These have been studied in laboratory plasmas. When an electrode is biased positively the sheath-plasma instability near the electron plasma frequency is observed. When a gridded sphere is biased positively the plasma bubble exhibits electron transit time oscillations. When the same sphere is biased negatively an instability near the ion plasma frequency is observed. In a magnetic field a ring of energetic electrons is formed around a positively biased electrode. Electron drift wave instabilities are observed. Such instabilities are important for correctly interpreting signals from antennas or tethers in space. (Work supported by DOE/NSF.)
Stenzel R. L.
Urrutia J. M.
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