Dynasonde observations of ionospheric modification experiments with the HIPAS observatory

Details Dynasonde observations of ionospheric modification experiments with the HIPAS observatory Dynasonde observations of ionospheric modification experiments with the HIPAS observatory

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..107t&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 2-3, p. 107-116.

Physics

Scientific paper

This paper presents experimental results derived from NOAA HF radar (dynasonde) measurements, done during the 1992 ionospheric modification campaign (Campaign'92) conducted at the UCLA HIPAS facility near Fairbanks, AK. During this campaign, the HIPAS transmitter illuminated the ionosphere with high frequency electromagnetic waves at 2.85 and 4.53MHz using a peak power of 1MW, an antenna gain of 18.4dBi, and a half-power beamwidth of /22°. As a tool for ionospheric diagnostics, the dynasonde utilizes interferometry techniques to provide high-resolution echolocation, line-of-sight Doppler velocity, and digital ionograms as fundamental data products. Here we present results, which suggest that high-power, ordinary mode pump waves transmitted during ``over-dense'' conditions can generate small-scale field-aligned irregularities and anomalous absorption, affecting diagnostic radio waves having both ordinary and extraordinary polarization. Furthermore, large-scale plasma density changes of /~30% were observed when the 2.85MHz heater frequency matched that of the ionospheric critical plasma frequency.

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