Phase-amplitude variations of the subauroral VLF field and the AA-type absorption

Details Phase-amplitude variations of the subauroral VLF field and the AA-type absorption Phase-amplitude variations of the subauroral VLF field and the AA-type absorption

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ge%26ae..16..679b&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 16, July-Aug. 1976, p. 679-683. In Russian.

Physics

Auroral Zones, Phase Shift, Polar Cap Absorption, Radio Attenuation, Vlf Emission Recorders, Riometers, Signal Measurement, Very Low Frequencies

Scientific paper

A distinct relationship has been shown to exist between riometer readings and VLF measurement data during periods of polar cap absorption. Recent data also suggest the existence of a definite relationship between VLF anomalies along high-altitude paths and AA type absorption. In the present paper, relationship between the variation of VLF signals and AA-type absorption is analyzed. It is shown that VLF-variations lead AA-absorption bays by 1.5 to 5 min. Results of phase-amplitude VLF measurements along moderately long latitude-oriented subauroral paths at frequencies of 10.2, 13.6, and 16.4 kHz are discussed. A tendency toward early appearance of phase-variations when the carrier frequency increases is demonstrated.

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