Observation of an antenna-plasma instability

Details Observation of an antenna-plasma instability Observation of an antenna-plasma instability

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7773k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7773-7788.

Physics

5

Magnetohydrodynamic Stability, Plasma Antennas, Rocket Flight, Space Plasmas, Dipole Antennas, Electrical Impedance, Geomagnetism, Phase Shift

Scientific paper

This paper investigates the conditions leading to, and the causes of, the phenomenon observed during a rocket flight (to 585-km altitude) of an occasionally occurring narrow-band signal on an electric antenna whose frequency was found to vary as the rocket turned. The amplitude also varied by a factor larger than can be explained by variable coupling to the plasma; maximum oscillation amplitude occurred when the antenna was aligned with the earth's magnetic field. A tentative explanation of this phenomenon is given, suggesting that the signals on the antenna were caused by an interacton of the flowing plasma with sheath waves around the antenna.

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