Direction findings of medium-latitude whistlers and their propagation characteristics

Details Direction findings of medium-latitude whistlers and their propagation characteristics Direction findings of medium-latitude whistlers and their propagation characteristics

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6939h&link_type=abstract

Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6939-6946.

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14

Diurnal Variations, Ionospheric Propagation, Midlatitude Atmosphere, Radio Direction Finders, Whistlers, Angular Distribution, Ducts, Electromagnetic Scattering, Longitudinal Waves, Polarized Electromagnetic Radiation, Statistical Analysis, Temporal Distribution, Waveguides

Scientific paper

The propagation characteristics of mid-latitude whistlers are investigated based on measurements made with a recently developed whistler direction finder and real-time whistler analyzer. Measurements were made at Moshiri (geomagnetic latitude 34.5 deg N, L = 1.6) during the day and night in January and February of 1978 by a direction finder employing the outputs of eight detectors to distinguish wave incidence situations and determine arrival directions and wave polarizations. The results obtained confirm the effectiveness of the direction finder in the location of ionospheric exit points in the presence of a single dominant wave and indicate the reliability, but decreased accuracy, of the system in other situations. Both daytime and nighttime whistlers are found to be attributable to ducted propagation, with the daytime whistlers due to a single duct. An apparent small drift of the exit points of the daytime whistlers is explained as being due to a temporal fluctuation of the propagation conditions between the duct endpoint and the lower boundary of the ionosphere, while a large apparent drift of nighttime whistler exit points is attributed to the combined effect of the presence of several ducts and the temporal variations of the source regions.

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