Generation of Alfven waves by upper hybrid waves

Details Generation of Alfven waves by upper hybrid waves Generation of Alfven waves by upper hybrid waves

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41b0565v&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41B-0565

Physics

0654 Plasmas, 2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2487 Wave Propagation (6934)

Scientific paper

There is a great interest in ionospheric heating and modification as evidenced by the HAARP facility in Alaska and a large effort in Norway, and long time effort at Arecibo. In a series of laboratory experiments at the upgraded LArge Plasma Device (LAPD) at UCLA we are simulating these interactions. We launch high power microwave pulses into a strongly magnetized plasma (n <= 1012 cm-3, B0 = 1 - 2.5 kG, He,Ne, Dia= 50 cm, Length 17m). The microwaves (f ˜= 9 GHz) are beamed either along the magnetic field into an axial density gradient or across the magnetic field into a radial density gradient. The microwave power is 250 kW for 1 μ s pulses. The plasma is diagnosed with high frequency rf probes, magnetic pickup loops and fast optical cameras. Preliminary results have shown evidence of a strong interaction, which we have tentatively identified as a large amplitude shear Alfven wave. When the microwaves are incident at right angles to the magnetic field Alfven waves are created at the upper hybrid resonance location which is determined by the magnetic field and local density. Preliminary data indicate that the Alfven waves are radiated by the current systems generated by fast electrons in the resonant region. We will present results of experiments focussing on the magnetic interaction measured with miniature pickup loops and on fast electron generation. Movies of the experimental data on the Alfven wave generation will be presented.

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