The daytime high-latitude trough and its possible association with travelling ionospheric disturbances

Details The daytime high-latitude trough and its possible association with travelling ionospheric disturbances The daytime high-latitude trough and its possible association with travelling ionospheric disturbances

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..476b&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, July 1991, p. 476-486. Research supported by Australian Research Council.

Physics

Polar Cusps, Spread F, Traveling Ionospheric Disturbances, Auroral Zones, Daytime, Magnetic Anomalies

Scientific paper

An analysis of ionograms from Ellsworth, Antarctica (CGlat = 62.6 deg S) has shown that the size of the daytime trough (as determined by the equatorward slope in the isoionic contours) is a function of geomagnetic activity. The trough activity is more intense and the onset times are earlier for higher geomagnetic activity. The principal features of the daytime trough (namely the modulated height rise in the isoionic contours, an electron-density depletion and spread-F occurrence during the recovery phase) are compared with similar features observed for midlatitude spread-F events. Evidence is presented to suggest that the day-to-day observation of the trough is a consequence of the passage of traveling ionospheric disturbances (TIDs) which originate around noon in the polar-cusp region (at approximately 80 deg CGlat). The different onset times are seen as a consequence of disturbance speeds also being a function of geomagnetic activity. Recent reports of the detection of TIDs in these daytime-trough regions are discussed.

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