Diurnal variation of burst precipitation effects on subionospheric VLF /LF signal propagation near L = 2

Details Diurnal variation of burst precipitation effects on subionospheric VLF /LF signal propagation near L = 2 Diurnal variation of burst precipitation effects on subionospheric VLF /LF signal propagation near L = 2

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9139l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 9139-9143.

Physics

29

Diurnal Variations, Electron Precipitation, Ionospheric Propagation, Terminator Lines, Very Low Frequencies, Antarctic Regions, Atmospheric Ionization, Bursts, Propagation Modes, Vlf Emission Recorders, Whistlers

Scientific paper

VLF and magnetometer data were gathered in a study of the effect of the sunrise-sunset terminator on Trimpi event activity and identify precipitation regions. The Trimpi effect is characterized by phase of amplitude disturbance of subionospherically propagating VLF signals in the presence of a whistler. VLF signals from 0.5-1.0 kHz and 2.0-4.0 kHz were transmitted from variously positioned stations during March 3-April 7, 1983. Daily occurrence rates were tracked for the Trimpi events and compared with the presence of ionospheric storms. Trimpi signal levels were 20-30 dB higher in nighttime than in daytime, and usually occurred on a path of all darkness. They were also associated with L = 2 on 70 percent of the nights. Longest event durations were on N-S signal paths making small angles with the terminator. The actual influence of whistler activity on the Trimpi effect has yet to be determined.

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