Measurement and theory of the spatial distribution of excitation by high-current electron beams injected into the ionosphere

Details Measurement and theory of the spatial distribution of excitation by high-current electron beams injected into the ionosphere Measurement and theory of the spatial distribution of excitation by high-current electron beams injected into the ionosphere

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1011k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Oct. 1984, p. 1011-1014.

Computer Science

Sound

5

E Region, Electron Beams, Ionospheric Sounding, Plasma Pumping, Plasma-Particle Interactions, Beam Interactions, High Current, Mathematical Models, Spatial Distribution

Scientific paper

Spatial distributions of energy deposition rates in EXCEDE Spectral's 3-keV, 7-A electron beam injection at E region altitudes derived from onboard photographic images of the air fluorescence are presented and compared with a time-dependent computational model of the collective beam-plasma interaction. The volume excitation rates decrease with a scale length of order 1 m near the rocket, are about 2 orders of magnitude greater than predicted from single particle transport calculations, and at fixed distances from the accelerator vary by less than a factor 3 over an ambient density range of at least 40. The data are consistent with a discharge model in which the driving beam plasma instability is an absolute hydrodynamic instability with energy deposition controlled by trapping, and axial dimension by ambipolar expansion of the plasma.

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