Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9515195n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Sept. 1, 1990, p. 15195-15207. Research supported by Aerospace Corp.
Physics
25
F Region, Field Aligned Currents, Ionospheric Propagation, Plasma Waves, Radar Measurement, Backscattering, High Frequencies
Scientific paper
A study aimed at examining the coupling between HF-induced Langmuir waves and artificially produced field-aligned irregularities is presented. The HF-enhanced plasma lines (HFPLs) were monitored with the Arecibo 430-MHz radar while simultaneous measurements of artificial geomagnetic field-aligned irregularities (AFAIs) were made with a mobile 49.92-MHz radar. The HF power was systematically increased and then decreased during the experimental period when a single data set was obtained under nearly ideal observing conditions. As the HF power is increased, the HFPL backscatter power starts to saturate at about 70 MW effective radiated power (ERP). However, the backscatter from AFAIs is linearly dependent on HF power, even at the greatest (120 MW ERP) HF power levels available at Arecibo.
Djuth Frank T.
Noble S. T.
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