High latitude observations of whistlers using three spaced goniometer receivers

Details High latitude observations of whistlers using three spaced goniometer receivers High latitude observations of whistlers using three spaced goniometer receivers

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..387s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, June 1983, p. 387-399. Research supported by the Scien

Physics

4

Polar Regions, Radiogoniometers, Whistler Recorders, Atmospheric Ionization, Auroras, Frequency Distribution, Plasmasphere, Ray Tracing, Temporal Distribution, Very Low Frequencies

Scientific paper

The triangulation of the azimuthal bearings of whistlers recorded during an auroral substorm located their exit points at a position corresponding to an L value of 6.4 + or - 0.2. The curve-fitting procedure of Tarcsai (1975) was then used to analyze the whistlers' frequency-time profiles in order to determine their ducted propagational L values, which were found to lie in the 2.8-4.0 range, assuming a diffusive equilibrium distribution along the field lines. This L value discrepancy is explainable in terms of the whistlers' following of a field-aligned ducted path through the plasmasphere and then, after being reflected by sporadic E ionization in the lower ionosphere, following a subprotonospheric path to higher latitude. Whistler spectra consistent with those observed are obtained by curve fitting to frequency-time profiles obtained by ray tracing.

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