The poleward leap of the auroral electrojet as seen in auroral images

Details The poleward leap of the auroral electrojet as seen in auroral images The poleward leap of the auroral electrojet as seen in auroral images

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.5333h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, June 1, 1985, p. 5333-5337. Research sponsored by the U.S. Department

Astronomy and Astrophysics

Astronomy

23

Auroral Electrojets, Earth Magnetosphere, Magnetic Storms, Plasma Sheaths, Satellite-Borne Instruments, Astronomical Photography, Dynamics Explorer 1 Satellite

Scientific paper

This paper discusses a recently published series of 12 successive images of the northern auroral oval obtained by the University of Iowa's auroral imager on DE 1 during a substorm on November 8, 1981. The images showed a sudden (within less than 12 min) thickening and poleward expansion of the midnight sector of the oval that occurred at the 'maximum epoch' of the substorm, i.e., as auroral zone bays reached their peaks and began to subside about 90 min after the expansive phase onset. It is proposed that this was the auroral manifestation of the poleward leap of the auroral electrojet that has been reported on many occasions to coincide with thickening of the plasma sheet in the outer magnetotail (beyond approximately 15 earth radii) late in a substorm. The plasma sheet thickening is thought to be associated with a tailward retreat of the substorm magnetic neutral line. Evidence is found that the neutral line's tailward retreat influences auroral currents and particle precipitation even at low auroral latitudes. Modifications of the present auroral substorm model are suggested.

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