On the proper motion of auroral arcs

Details On the proper motion of auroral arcs On the proper motion of auroral arcs

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.6087h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 6087-6099.

Physics

40

Auroral Arcs, Eiscat Radar System (Europe), F Region, Field Aligned Currents, Magnetohydrodynamic Flow, Flow Velocity, Plasma Dynamics, Velocity Measurement

Scientific paper

The ability of the tristatic UHF radar of EISCAT to measure plasma velocities in the F region has been employed for the assessment of such motions in the proximity of and relative to auroral arcs using real-time tracking of the arcs with the radar on command from the ground station. Slow relative motions of arc and plasma of the order of 30 to 90 m/s were deduced from the observations, but the error sources are considerable. Three cases are presented, representing different situations. The arc may move into an auroral current system or out of it. The first case corresponds to an energy reduction, the second to a buildup of the energy content of the current system; oscillator/motions alternating between these situations lie in the Pc 5 range, and attest to an interaction of the energy release region (auroral acceleration region) and the generator via sheer Alfven waves. The events are interpreted in the light of the 'fracture model' of auroral arcs.

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