Grossly-distorted isoionic contours associated with spread-F occurrence at mid-latitudes

Bowman G.G. and Dunne G.S. (1984) Grossly-distorted isoionic contours associated with spread-F occurrence at mid-latitudes. Journal of Atmospheric and Terrestrial Physics, 46 12: . doi:10.1016/0021-9169(84)90109-0


Author Bowman G.G.
Dunne G.S.
Title Grossly-distorted isoionic contours associated with spread-F occurrence at mid-latitudes
Journal name Journal of Atmospheric and Terrestrial Physics
ISSN 0021-9169
Publication date 1984
Sub-type Article (original research)
DOI 10.1016/0021-9169(84)90109-0
Volume 46
Issue 12
Total pages 1
Subject 1902 Film, Television and Digital Media
1908 Geophysics
Abstract A directional ionosonde has been used to investigate a mid-latitude travelling ionospheric disturbance which passed over Brisbane, Australia, on the night of 31 July/1 August 1981. The analyses have revealed what appears to be a large-scale frontal height rise (about 300 km wide) travelling in a north-west direction with a speed of 93 ms-1. Smaller-scale frontal structures with wavelengths of some tens of kilometres appeared near the crest of this large-scale upwelling and have the same frontal orientations. These are responsible for the spread-F seen on ionograms during the passage of the disturbance. Also, associated with the disturbance was a tongue of ionization which extended down from the crest of the upwelling more than 100 km. It appeared to be drifting with the same speed and in the same direction as the upwelling. Near the lowest extremity of the tongue the ionization density was at least 35% greater than elsewhere in the ionosphere. The lowest extremity of the tongue was located 240 km from the recording station as the large-scale frontal structure passed overhead. Statistical analyses using 19 tongue events in 1979 have shown that ionospheric height rises seem to be generally associated with these events not only at the recording station, but also in the conjugate hemisphere. Certain characteristics of the mid-latitude disturbance which have been investigated in this paper are compared with the characteristics of similar disturbances in equatorial regions.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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