Non-ducted whistler-mode signals at low latitudes

Details Non-ducted whistler-mode signals at low latitudes Non-ducted whistler-mode signals at low latitudes

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..429a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Apr. 1978, p. 429-436.

Physics

3

Equatorial Atmosphere, Ionospheric Propagation, Propagation Modes, Solar Activity Effects, Whistlers, Atmospheric Physics, Ray Tracing, Sunspots, Very Low Frequencies, Waveguides

Scientific paper

It has been shown that a component of VLF signal from station NLK, near Seattle, received on a trans-equatorial path at Wellington, appeared to have left the earth-ionosphere waveguide at low latitudes and crossed the equator in the whistler mode. Results from a VLF recorder at Rarotonga (lat. 21 deg S) show that similar signals are indeed common at low latitudes. Recent calculations by Singh (1976) have established that a nonducted VLF mode could exist at a latitude of about 20 deg in the presence of horizontal gradients of ionization. It is pointed out that a second nonducted path, first implied by Scarabucci (1970), appears possible at still lower latitudes when the O(+) to H(+) transition height in the ionosphere is high. While firm conclusions cannot be drawn, the low Doppler shift on the observed signals and the tendency for their occurrence to maximize before dawn and at solar maximum are features which tend to favor the very low latitude path.

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