The influence of the equatorial anomaly on the ground reception of non-ducted whistlers at low latitudes

Details The influence of the equatorial anomaly on the ground reception of non-ducted whistlers at low latitudes The influence of the equatorial anomaly on the ground reception of non-ducted whistlers at low latitudes

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28...17h&link_type=abstract

Planetary and Space Science, vol. 28, Jan. 1980, p. 17-28.

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Computation

Equatorial Atmosphere, Magnetic Anomalies, Plasmasphere, Tropical Regions, Whistlers, Atmospheric Models, Diurnal Variations, Magnetospheric Electron Density, Propagation Modes, Ray Tracing, Whispering Gallery Modes

Scientific paper

It is the purpose of this paper to study whether the non-ducted propagation in the inner plasmasphere in the presence of the equatorial anomaly might be relevant to daytime whistlers observed on the ground at low latitudes. Realistic models of the equatorial anomaly simulating the satellite observations have been incorporated in the ray tracing computations. It is found that there are two different non-ducted modes able to penetrate through the ionosphere onto the ground: (1) whispering gallery mode around the anomaly field line which is trapped just by the outer boundary of the anomaly, and (2) pro-longitudinal (PL) mode at a latitude around 30 deg which is supported by the horizontal gradient in the tail of the anomaly. These modes may provide a new interpretation for some whistlers observed on the ground. The properties of these modes are examined in detail and then compared with those of ducted propagation. This study may be useful for distinguishing the propagation mode in future ground-based experiments.

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