On whistlers with very low dispersion

Details On whistlers with very low dispersion On whistlers with very low dispersion

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..231a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 41, Feb. 1979, p. 231-235.

Physics

1

Equatorial Atmosphere, Ionospheric Propagation, Propagation Modes, Whistlers, Charge Transfer, Upper Ionosphere, Vertical Distribution, Wave Dispersion

Scientific paper

The purpose of this note is to show that the nonducted low latitude VLF path proposed earlier to explain certain whistler mode observations of signals from a VLF transmitter (Andrews, 1978), may also provide an explanation for the observation of natural whistlers with dispersions of about 10 s to the 1/2 power at very low latitudes. The existence of the path requires the O(+) to H(+) transition level in the topside ionosphere to be above about 700 km altitude. If this condition is fulfilled, one or two refracting 'channels', about 0.5 deg wide, are produced which enable all frequencies within a whistler to arrive with approximately constant dispersion and with wavenormals vertical, and so be transmitted out of the ionosphere.

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