Magnetotail boundary motion associated with geomagnetic substorms

Physics

Scientific paper

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Geomagnetic Tail, Magnetic Storms, Magnetopause, Dynamic Response, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Flux, Magnetic Signatures, Magnetospheric Instability, Time Response

Scientific paper

Motions of the magnetotail boundary during substorms are investigated by satellite data analysis. It is found that the magnetotail radius increases during the 1-2 hours before the substorm expansion phase onset. Shortly after the onset time the tail radius begins to decrease rapidly and recovers to the presubstorm value generally within about 1 hour of the expansion phase onset. Time history of the increment in the tail radius resembles that of the lobe magnetic field magnitude. This confirms that both phenomena are manifestations of the increase in the total magnetic flux in the tail lobe. The average increment in the tail radius in the region between -30 and -70 earth radii is probably about 1-2 earth radii. This value accounts for 15-45% of the total flux increase in the tail lobe.

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