Thermal fluctuations from an artificial ion beam injection into the ionosphere

Details Thermal fluctuations from an artificial ion beam injection into the ionosphere Thermal fluctuations from an artificial ion beam injection into the ionosphere

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9812h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9812-9822. Research supported by the University of C

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17

Argon Plasma, Beam Injection, Ionospheric Sounding, Rocket Sounding, Environment Simulation, Ionospheric Electron Density, Ionospheric Ion Density, Oxygen Ions, Power Spectra

Scientific paper

Simulations of argon beam experiments flown on two sounding rocket flights (ARCS 1, 2) reveal two bands of electrostatic wave emissions, one at high frequencies around the upper hybrid mode, the other at low frequencies around the lower hybrid mode. The latter is significantly enhanced by the argon beam in the simulations, and the enhancement was clearly observed on ARCS 2. This enhancement at phase velocities greater than the beam velocity is suggested to be due to an increase in the thermal fluctuation level of the plasma when the argon beam is present. Inclusion of electron dynamics and oblique angles of wave propagation with respect to B allows investigation of electron heating. Electron tail heating is observed parallel to B for k-parallel/k-perpendicular proportional to the square root of m(e)/m(0), while background ions are heated perpendicular to B.

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