Other
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..829b&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 6, June 1992, p. 829-845. Research supported by Australian Research C
Other
13
Gravity Waves, Magnetic Storms, Traveling Ionospheric Disturbances, Wave Propagation, Ionosondes, Ionospheric Electron Density, Spread F, Vertical Distribution
Scientific paper
On two occasions the speeds and directions of travel of large-scale traveling ionospheric disturbances (LS-TIDs) following geomagnetic substorm onsets, have been calculated for the propagation of these disturbances in both hemispheres of the earth. N(h) analyses have been used to produce height change profiles at a fixed frequency from which time shifts between stations (used for the speed and direction-of-travel values) have been calculated. Fixed-frequency phase path measurements at Bribie Island for two events reveal wavetrains with periodicities around 17 min associated with these disturbances. Another event recorded a periodicity of 19 min. Also, for two of the events additional periodicities around 30 min were found. These wavetrains along with the macroscale height changes and electron density depletions associated with these LS-TIDs are essentially the same as the ionospheric structure changes observed during the passage of night-time medium-scale traveling ionospheric disturbances (MS-TIDs). However, unlike these MS-TIDs, the LS-TIDs are generally not associated with the recording of spread-F on ionograms. Possible reasons for this difference are discussed as well as the special conditions which probably prevail on the few occasions when spread-F is associated with LS-TIDs.
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