Conjugate effects in the generation of travelling ionospheric disturbances (TIDs) in the F-region

Physics

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Auroral Absorption, Conjugate Points, F Region, Particle Precipitation, Traveling Ionospheric Disturbances, Ground Stations, Magnetic Storms, Northern Hemisphere, Riometers, Southern Hemisphere

Scientific paper

Measurements obtained during a severe auroral substorm on April 3, 1979, with 10 standard vertical-incidence ionosondes and 5 standard 30-MHz riometers situated at widely varying northern and southern latitudes (the riometers in conjugate areas) are presented graphically and discussed. The rapid onsets of absorption recorded simultaneously at the conjugate riometers were followed by global-scale F-region TIDs which spread from both auroral regions toward the equator at estimated rates of 630 and 560 (both + or - 100) m/sec in the Southern and Northern Hemisphere, respectively. TID generation is attributed to an impulse-like conjugate particle-precipitation increase occurring in a shell at least 17 deg (longitude) long and with an equatorward edge between L values 5.0 and 5.3.

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