C-layer dependence on solar cycle and southern latitude observed by VLF propagation

Details C-layer dependence on solar cycle and southern latitude observed by VLF propagation C-layer dependence on solar cycle and southern latitude observed by VLF propagation

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..419k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, May 1991, p. 419-423. Research supported by Brazilian

Physics

1

Ionospheric Electron Density, Lower Ionosphere, Solar Cycles, Solar Terrestrial Interactions, Very Low Frequencies, Wave Propagation, Annual Variations, Phase Shift, Southern Hemisphere

Scientific paper

The formation of the C-layer as observed on long distance VLF propagation paths may be described as an additional phase advance during the normal sunrise phase advance. The effect has a typical recovery time of 90 min. It has been verified that it occurs not only in winter, as previously suggested, but that it is also independent of seasonal variations, when the angle between the solar illumination line (terminator) and the propagation path is small. Analysis of different propagation paths shows that the magnitude of the observed effect exhibits an annual variation and a latitudinal and solar cycle dependence.

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