The onset of an auroral absorption substorm

Details The onset of an auroral absorption substorm The onset of an auroral absorption substorm

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3893r&link_type=abstract

Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3893-3899.

Physics

Auroral Absorption, Geomagnetism, Magnetic Storms, Graphs (Charts), Polar Regions, Riometers

Scientific paper

Riometer data for three different substorms (January 6, April 6, and November 3, 1975) are discussed with reference to onset phenomena. In the longitudinal sector where the substorm breaks up, a sharp onset is preceded by weak absorption which intensifies as it moves equatorward. The maximum value of absorption after the onset depends on the intensification of the equatorward-moving absorption preceding the breakup. The data suggest that the weak absorption decreases to a minimum just before the onset. At longitudes near the breakup a sharp onset occurs without any preceding absorption or, possibly, the minimum of the absorption preceding the onset lasts longer. Study of a fourth substorm (January 7, 1975) shows that a substorm can break up at two different longitudinal sectors almost simultaneously.

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