On the poleward expansion of ionospheric absorption regions triggered by sudden commencements of geomagnetic storms

Details On the poleward expansion of ionospheric absorption regions triggered by sudden commencements of geomagnetic storms On the poleward expansion of ionospheric absorption regions triggered by sudden commencements of geomagnetic storms

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1169b&link_type=abstract

Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 1169-1171.

Physics

1

Auroral Absorption, Ionospheric Propagation, Magnetic Storms, Sudden Storm Commencements, Earth Magnetosphere, Magnetoactivity, Riometers

Scientific paper

A review of riometer data from the south pole (74.2 deg invariant latitude) for a 7-year period (1967-1973) indicates the occurrence of sc-triggered poleward expansions of auroral absorption regions. For 15 such events the average AE index in the hour before the sc's was twice as large as that for 30 sc's that did not trigger substorm events at auroral latitudes. This result indicates that the triggering of substorms involves the enhancement of processes already in progress by the compression of the magnetosphere.

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