Computer Science – Sound
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315105m&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 15, CiteID L15105
Computer Science
Sound
1
Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Active Experiments, Ionosphere: Particle Acceleration, Ionosphere: Plasma Waves And Instabilities (2772)
Scientific paper
A specially-designed sounding rocket experiment with a bare, conducting tether was recently suggested to test an idea that tether-produced energetic-electron beams can be used for remote sensing the neutral density in the E region. This letter contains the theoretical analysis of collisionless beam-plasma interactions (BPI) that complement direct impact of the energetic electrons with neutral particles. Collisionless effects are shown to play a significant and even major role in tether-induced aurora (TA). In the F region, BPI lead to appreciable green-line (557.7 nm) emissions at ~200 km. Farther downward, BPI develop inside a local minimum in the plasma density between the E and F regions, the so-called valley. Here a thin layer of a strongly-elevated electron temperature and airglow is predicted. Neutralizing electric currents carried by ionospheric electrons can become unstable in the low-density valley. As a result, developing plasma waves inhibit the currents. In the extreme case, the beam might be locked (a `virtual cathode'). In addition to optical observations, these effects can also be observed by radio frequency methods.
Khazanov George V.
Mishin Evgeni V.
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