The diffraction of VLF radio waves by a patch of ionosphere illuminated by a powerful HF transmitter

Details The diffraction of VLF radio waves by a patch of ionosphere illuminated by a powerful HF transmitter The diffraction of VLF radio waves by a patch of ionosphere illuminated by a powerful HF transmitter

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2861b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, March 1, 1985, p. 2861-2875. Research supported by the Deutsche Forsc

Physics

28

Auroral Zones, Diffraction Propagation, Ionospheric Heating, Ionospheric Propagation, Radio Frequency Heating, Very Low Frequencies, D Region, High Frequencies, Ionospheric Disturbances

Scientific paper

The effects of heating a fragment of auroral ionosphere with powerful HF radiation on the short-path propagation parameters of VLF waves (12.1 and 16.4 kHz) are investigated. Typical amplitude and phase perturbations of + or - 0.05 dB and + or 0.5 deg were observed with effective radiated powers of 200 MW and an effective antenna beam width of 15 deg. The amplitude and phase perturbations at a fixed beam deflection angle (38 deg S) were found to reach 6 dB and 50 deg, respectively, during minimum VLF field strength values. Moreover, the impact of the diffractive effects of such heating of the ionosphere on the multimode propagation in the earth-ionosphere waveguide are assessed theoretically for daytime and nighttime conditions, and the normal and enhanced amplitude and phase perturbations are modeled and compared to observations.

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