VLF plasma wave excitation due to low-energy electron beam injection - Laboratory simulation of a rocket experiment

Details VLF plasma wave excitation due to low-energy electron beam injection - Laboratory simulation of a rocket experiment VLF plasma wave excitation due to low-energy electron beam injection - Laboratory simulation of a rocket experiment

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4217t&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4217-4223.

Computer Science

Sound

Electron Beams, Ionospheric Sounding, Plasma Waves, Plasma-Particle Interactions, Space Environment Simulation, Vlf Emission Recorders, Wave Excitation, Ion Cyclotron Radiation, Ionic Mobility, Ionospheric Disturbances, Phase Velocity, Rocket Sounding

Scientific paper

A laboratory simulation experiment of low-energy electron-beam injection into the ionosphere is performed. Two kinds of waves are excited in the VLF frequency range. One with a lower frequency is shown to be caused by an interaction between a beam with a finite cross section and a background plasma. The other with a higher frequency is shown to be caused by current-driven ion turbulence due to an electron return current. These two kinds of VLF waves have been observed before in Japanese rocket experiments in the ionosphere. A retarding-potential-analyzer measurement revealed that the injected beam has a diameter twice as large as the cyclotron radius of beaming electrons. It is shown that the field intensity of the excited VLF waves drops off outside the measured beam column. A correlation measurement of the phase of the VLF wave shows that the phase velocity of the wave excited by the beam instability is equal to that of ion acoustic waves. A dispersion and wave-vector measurement has shown that the current-driven ion turbulence is an ion cyclotron wave whose phase velocity is of the order of the ion acoustic wave velocity.

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