Langmuir and Lower Hybrid Wave Bursts in a Laboratory Model of Ionospheric Modification

Details Langmuir and Lower Hybrid Wave Bursts in a Laboratory Model of Ionospheric Modification Langmuir and Lower Hybrid Wave Bursts in a Laboratory Model of Ionospheric Modification

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0687d&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0687

Physics

0639 Nonlinear Electromagnetics, 2403 Active Experiments, 6944 Nonlinear Phenomena, 6984 Waves In Plasma, 7831 Laboratory Studies

Scientific paper

Laboratory simulations were performed in the Versatile Toroidal Facility to help resolve ambiguities inherent in interpretations of remotely sensed ionospheric modification experiments. The pump waves of ionospheric experiments were simulated by launching 2.45~GHz microwaves perpendicular to the density gradient in the ordinary mode. Wave spectra and field strengths were measured within the reflection layer using a miniature double probe and a microwave receiver. The main observations are of (1)~Langmuir waves that are both up- and down-shifted with respect to the pump frequency, (2)~broadband RF-produced lower hybrid waves, (3)~anti-correlated bursts of Langmuir and lower hybrid waves having durations and periods between 2 and 100~μ s, and (4)~hundred fold variation of pump electric fields from 1.3 to 130 kV/m during bursts. The observed wave bursts suggest that quasi-periodic electric field concentrations develop in small time-varying regions. The detection of lower hybrid waves indicates a need for incorporating magnetized plasma modes into heating theory.

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