Equatorwards limits of the southern scintillation oval

Details Equatorwards limits of the southern scintillation oval Equatorwards limits of the southern scintillation oval

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..539h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, June 1982, p. 539-543, 545. Research supported by the Australian Radio

Physics

6

Auroral Zones, Ionograms, Radio Signals, Scintillation, Southern Hemisphere, Traveling Ionospheric Disturbances, Equinoxes, Magnetic Disturbances, Polar Caps, Solar Activity Effects, Spatial Distribution, Spread F, Temperate Regions, Very High Frequencies

Scientific paper

Radio signals in the VHF range were recorded and compared with ionograms over a wide range of southern latitudes during a few equinoctial months for which a large variation in the magnetic disturbance level was observed. It is evident that the equatorwards edge of the auroral scintillation oval extends well into mid-latitudes for high values of magnetic K-index. The range-spreading type of spread-F and scintillation-producing irregularities show a high degree of spatial coincidence from the polar cap to mid-latitudes. It is suggested that the inhomogeneities responsible for both ionospheric phenomena are associated with the equatorwards propagation of travelling ionospheric disturbances (TIDs) generated in the auroral zone.

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