Studies of Strong Langmuir Turbulence Experiments at HAARP

Details Studies of Strong Langmuir Turbulence Experiments at HAARP Studies of Strong Langmuir Turbulence Experiments at HAARP

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1470s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1470

Physics

[2403] Ionosphere / Active Experiments, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

We report the results from a recent series of campaigns employing the HAARP HF transmitter near Gakona, AK to generate and study strong Langmuir turbulence (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the SuperDARN-Kodiak HF radar, and HF receivers to record stimulated electromagnetic emissions (SEE). The dependence of diagnostic signals and spectra upon HAARP HF parameters, including pulselength, duty-cycle, and aspect angle were recorded. Short HF pulse (< 60 ms), low duty cycle (< 0.5%) experiments demonstrate control of artificial field-aligned irregularities (AFAI). Among the effects observed and studied are: SLT plasma line spectra including cascade, collapse, and co-existence spectra and an outshifted plasma line. High time resolution studies of the temporal evolution of the plasma line reveal the appearance of a prompt overshoot effect on ponderomotive timescales. Plasma line spectra exhibit marked dependences on HF aspect angle and MUIR pointing, including the discovery of a second region of strong turbulence displaced southward from the primary HF interaction region along the geomagnetic field line. Experimental results are compared to previous high latitude experiments and predictions from recent modeling efforts.

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