Observations and characterization of HAARP induced F-region decameter scale plasma density irregularities using the new imaging capabilities of the Kodiak Island SuperDARN radar

Details Observations and characterization of HAARP induced F-region decameter scale plasma density irregularities using the new imaging capabilities of the Kodiak Island SuperDARN radar Observations and characterization of HAARP induced F-region decameter scale plasma density irregularities using the new imaging capabilities of the Kodiak Island SuperDARN radar

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1481p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1481

Physics

[2403] Ionosphere / Active Experiments, [2439] Ionosphere / Ionospheric Irregularities, [2494] Ionosphere / Instruments And Techniques, [6929] Radio Science / Ionospheric Physics

Scientific paper

The SuperDARN HF radar on Kodiak Island was upgraded with a new digital receiver system in May 2008. This new system improves on the old time delay beam former by treating each antenna in the radar’s array as an individual sensor, rather than treating the entire array as a single sensor. Given the array geometry, this new receiver system provides radar echo signals along 35 unique baseline separations. The phase of the echo signals along these baselines is used to create images of the target distribution within the radar field-of-view. Hyper-spectral estimation techniques are applied to the spatial phase information to create radar images with significantly better resolution than standard beam forming techniques. A new digital up converter system, installed concurrently with the digital receiver system, allows radar transmit beam broadening to illuminate a larger azimuth. In the case of HAARP, the entire interaction region can now be illuminated by the Kodiak radar with a single beam, rather than over several beams. This broader transmitter beam, combined with hyper spectral radar imaging, allows observations of the whole F-region HAARP interaction region with better temporal and spatial resolutions than were previously possible. Since the imaging receivers were installed, there have been a number of HAARP campaigns that have yielded observations under a range of conditions, including various HAARP transmitter frequencies, and different background environment conditions. This presentation describes the SuperDARN imaging system and compares observations from selected intervals.

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