On the propagation of daytime whistlers at low latitudes

Details On the propagation of daytime whistlers at low latitudes On the propagation of daytime whistlers at low latitudes

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3457t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, April 1, 1985, p. 3457-3464.

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Equatorial Atmosphere, Geomagnetic Latitude, Ionospheric Electron Density, Ray Tracing, Whistlers, Daytime, Ducted Flow, Japan, Waveguides

Scientific paper

For the daytime whistlers frequently observed in the late afternoon at low latitudes, ducted propagation has been experimentally evidenced, and association with the equatorial anomaly has been suggested. It is suggested from the present computations of ray tracing and wave absorption that the ground-based daytime whistlers may be attributed to propagation trapped in field-aligned structures of electron density (ducts) with a small dimension of 10-50 km width and a large enhancement factor of 100-300 percent either present within or superimposed on the high-latitude flank of the equatorial anomaly. A low-latitude cutoff of occurrence of the daytime whistlers at a geomagnetic latitude of approximately 20 deg, as experimentally established is predicted.

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