Stimulated Emissions and Radar Scatter from Pulsed and ELF Modulated RF-Ionosphere Interactions at HAARP

Details Stimulated Emissions and Radar Scatter from Pulsed and ELF Modulated RF-Ionosphere Interactions at HAARP Stimulated Emissions and Radar Scatter from Pulsed and ELF Modulated RF-Ionosphere Interactions at HAARP

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0406s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0406

Physics

2403 Active Experiments

Scientific paper

High power HF radiowave pulses launched from ground-based transmitters interact with overdense quiescent ionospheric plasma to produce strong turbulence effects. Many experiments of this type employ receivers to record the stimulated electromagnetic emissions (SEE) produced during relatively long (seconds) HF pulses. Long HF pulses are sufficient to produce irregularities and turbulence at several scales incorporating many effects. Effects which dominate for short HF pulses of interest may be masked by turbulence which develops on larger scales for longer HF pulses. We report a series of experiments performed at HAARP (Gakona, Alaska) using both radar, SEE and ELF diagnostics for a wide range of HF pulse widths down to ten milliseconds and several HF amplitude modulation frequencies of interest in the ELF range. Using short HF pulses, we are able to discriminate, characterize, and compare prompt SEE spectra over the time-scales of typical radar features. The SuperDARN-Kodiak radar reveals the growth of striations for longer HF pulsewidths. The SEE spectra taken during with short, low duty cycle HF pulses may be compared to models of SEE generation mechanisms. SEE spectra were also recorded using HF modulations in ELF range of interest and in the E-region ionosphere. We present the results of numerical simulations modeling the development of strong short-scale turbulence and mesoscale irregularities for comparison with these experiments.

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