Impulsive reconnection in the magnetotail during substorm expansion

Details Impulsive reconnection in the magnetotail during substorm expansion Impulsive reconnection in the magnetotail during substorm expansion

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1199s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Sept. 1987, p. 1199-1212.

Computer Science

20

Geomagnetic Tail, Magnetic Field Reconnection, Magnetic Storms, Magnetospheric Instability, Atmospheric Models, Electric Field Strength, International Sun Earth Explorer 1, Magnetic Flux, Magnetic Signatures, Satellite Observation

Scientific paper

Magnetic and electric field variations measured by the ISEE-1 spacecraft within the plasma sheet (PS) have been studied during the initial stage of a strong substorm event. A plasmoid structure was generated at the substorm onset and then passed tailwards removing most of the previously large northward magnetic flux closed across the equatorial plane. During the following 20 min, a few individual bursts of positive Ey and southward Bz field components were detected within the PS tailwards of the reconnection site simultaneously with Pi1 bursts in the conjugate sector of the auroral zone. No signatures of ejected or growing magnetic islands were found in association with these bursts. The details of these burst-like variations agree with those predicted by the transient reconnection model, which describes the propagation of the disturbance launched from the local reconnection region. It is concluded that the impulsive development of the expansion phase related phenomena shown by recent studies originates from impulsive modulation of the reconnection rate in the magnetotail.

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