Permanent flare activity in the magnetosphere during periods of low magnetic activity in the auroral zone

Details Permanent flare activity in the magnetosphere during periods of low magnetic activity in the auroral zone Permanent flare activity in the magnetosphere during periods of low magnetic activity in the auroral zone

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34.1169s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Dec. 1986, p. 1169-1188.

Physics

31

Auroral Zones, Earth Magnetosphere, Magnetic Disturbances, Plasma Dynamics, Auroral Arcs, Flares, Geomagnetic Tail, Magnetohydrodynamic Flow, Plasma Layers, Polar Substorms

Scientific paper

Auroral magnetic variation and pulsation data from the dense network in the near-midnight portion of the auroral zone are used together with the measurements of suprathermal particles and characteristics of activity during two magnetically quiet periods on Mar. 3, 1976 and Mar. 23, 1979. Contrary to existing beliefs, clear signatures of numerous (5-10 events per hour) transient events were found, characterized by plasma flows, energetic particle bursts, and E-B field variations. A close association of these events in the plasma sheet with the local auroral flares (LAFs) in the conjugate sector of the auroral zone is established for many events. It is concluded that LAF (local auroral arc activation with associated Pi pulsations but extremely weak magnetic bays) have the same plasma sheet manifestations (apparently, the same physics) as the individual substorm intensifications during strong substorm expansion events, which differ from the studied quiet periods mainly by the strength and number of these intensifications. These transient phenomena seem to play an important role in the energetics of the quiet time magnetotail.

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