The upper cut-off frequency of nose whistlers and implications for duct structure

Details The upper cut-off frequency of nose whistlers and implications for duct structure The upper cut-off frequency of nose whistlers and implications for duct structure

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..151s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Jan.-Feb. 1991, p. 151-169.

Physics

15

Ionospheric Electron Density, Ionospheric Propagation, Plasmasphere, Propagation Modes, Whistlers, Equatorial Atmosphere, Gyrofrequency, Magnetic Effects

Scientific paper

The duct enhancement required for interhemispheric propagation of whistlers, at frequencies in the vicinity of half the equatorial electron gyrofrequency, appears in view of the present considerations to have been significantly underestimated; in addition, the distribution of whistler cutoff frequencies experimantally ascertained for L = 4 does not agree with trapping in ducts of uniform density enhancement along their length. It is suggested that this discrepancy can be minimized if ground-observed whistlers are always due to amplification dependent on a wave-amplitude threshold. In this way, only those whistlers which are guided in the larger enhancements, and as a result possess greater signal strength, are amplified. Ducts must also have considerable fine structure, and must possess an enhancement of about an order of magnitude along their length from low altitude to the equatorial plane.

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