Power Thresholds of SPEAR-induced Irregularities at Very High Latitudes

Details Power Thresholds of SPEAR-induced Irregularities at Very High Latitudes Power Thresholds of SPEAR-induced Irregularities at Very High Latitudes

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa53c..06w&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SA53C-06

Physics

Plasma Physics

2403 Active Experiments

Scientific paper

SPEAR (Space Plasma Exploration by Active Radar) is a high power facility uniquely located to study the plasma physics and geophysics of the very high latitude magnetosphere and ionosphere. Recently, experiments have been undertaken to investigate the power thresholds required to excite field-aligned irregularities (FAIs). The artificially stimulated FAI act as intense targets in the fields of view of the CUTLASS HF coherent radar pair. Data derived using this artificial backscatter technique demonstrate that SPEAR effective radiated powers (ERPs) of the order of 1 MW or less are capable of initiating the formation of the FAI. This represents only 1/30th of the heating capability of SPEAR. Ionospheric hysteresis was also observed to occur during the experiments. This relates to the nature of the instability which leads to their excitation.

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