The delayed occurrence of equatorial ionospheric F2 layer post-sunset height decreases following auroral-zone substorm onsets

Details The delayed occurrence of equatorial ionospheric F2 layer post-sunset height decreases following auroral-zone substorm onsets The delayed occurrence of equatorial ionospheric F2 layer post-sunset height decreases following auroral-zone substorm onsets

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..234b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 2-3, p. 234-240.

Physics

1

F2 Layer Ionospheric Disturbances, Neutral Particle Density, The Influence Of Ls-Tids, Equatorial Ionosphere

Scientific paper

Nighttime F2 layer height decreases have been examined for post-sunset intervals at the equatorial station, Huancayo. The analyses involved mainly Rz max years, (1957-1960), although Rz min years (1974-1977) were also used. The data were obtained from tabulations of the ionogram parameters h'F, f[circle, open]F2 and f[circle, open]Es. The height reductions are delayed by more than 7 h following geomagnetic substorm onsets for locations at longitudes to the east. The reduced occurrence of spread-F and f[circle, open]Es enhancements is found to be associated. These enhancements are also recorded at the European station, Dourbes about 4.5 h before the Huancayo enhancements. It is proposed that an LS-TID which propagates in the 80 km sound channel may be involved. Also, the experimental evidence suggests that the westward propagation of the LS-TIDs allows equatorial disturbances to occur at local times (before midnight) which are similar to the times when the LS-TIDs are generated.

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