Small-scale ionospheric troughs detected over a range of mid-latitude locations

Details Small-scale ionospheric troughs detected over a range of mid-latitude locations Small-scale ionospheric troughs detected over a range of mid-latitude locations

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..470b&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, July 1991, p. 470-475. Research supported by Australian Research Council.

Physics

9

Spread F, Temperate Regions, Traveling Ionospheric Disturbances, Earth Ionosphere, Gravity Waves, Ionospheric Electron Density

Scientific paper

Spread-F structures at three spaced midlatitude stations (Canberra, 45 deg CGlat; Bribie Island, 36 deg CGlat; Townsville, 28 deg CGlat) obtained by N(h) analyses reveal modulated ionospheric height rises, electron-density depletions with spread-F recorded during the recovery stage of these ionospheric structure changes. At Bribie Island, fixed-frequency phase-path measurements (at 1.98 MHz) reveal a traveling ionospheric disturbance wavetrain of several cycles (periodicity 25 m) before and during the height rise associated with the spread-F event. When these midlatitude spread-F characteristics (including speeds of movement) are compared with those related to the daytime trough in high-latitude regions, the two phenomena are found to be similar. However, the magnitudes of the high-latitude changes are much greater than for the midlatitude spread-F events. It is suggested that both phenomena may result from the breaking of atmospheric gravity waves.

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