Plasma waves produced by an ion beam: Observations by the VLF experiment on Porcupine

Details Plasma waves produced by an ion beam: Observations by the VLF experiment on Porcupine Plasma waves produced by an ion beam: Observations by the VLF experiment on Porcupine

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.152..411j&link_type=abstract

In ESA European Rocket and Balloon Programs and Related Res. p 411-415 (SEE N81-10914 01-99)

Computer Science

Sound

Ion Beams, Magnetohydrodynamic Stability, Plasma Waves, Rocket Sounding, Very Low Frequencies, Cyclotron Frequency, Electric Fields, Harmonics, Ion Sources, Proton Magnetic Resonance, Xenon

Scientific paper

Results are presented from the VLF electric field experiments flown on Porcupine flights F3 and F4, which also had ejectable xenon ion sources. The xenon ion beam was found to produce plasma instabilities whose frequencies could be linked to the local proton gyrofrequency. The main energy in the instabilities lies at 3kHz for events when the Xe+ source is close to the rocket, and at 7kHz when the source is farther away. Theory predicts that these frequencies should be the lower-hybrid-resonance and this implies that Xe+ is the dominant ion in the first case and that it is the ambient plasma that dominates later. There is no discernable antenna spin-modulation during the Xe events which indicates that the wave k-vectors are not unidirectional. A theory is cited based on the setting up of the proton cyclotron harmonic waves by the Xe+ or 0+ cyclotron harmonic waves. The second Xe+ event on both flights exhibited an, as yet, unexplained harmonic structure related to half the local proton gyrofrequency.

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