Fast earthward plasma flows observed in the mid/distant tail under quiet conditions: Relation to substorms

Details Fast earthward plasma flows observed in the mid/distant tail under quiet conditions: Relation to substorms Fast earthward plasma flows observed in the mid/distant tail under quiet conditions: Relation to substorms

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..643t&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 6, p. 643-646

Physics

Plasma Physics

5

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Space Plasma Physics: Magnetic Reconnection

Scientific paper

Measurements of the magnetic field and low energy plasma by the GEOTAIL spacecraft have been used to study fast earthward plasma flows in the distant (130-200RE) and middle (40-80RE) tail and their relationship to substorms. Results of the analysis show that high-speed earthward ion flows are often observed in the mid/distant tail under conditions of low magnetic activity (AE~100nT), when the IMF BZ component is northward or oscillates to about zero. A considerable portion of the fast earthward flows (29% in the distant tail and 53% in the middle tail) seems to be a precursor to substorm expansion onsets on the Earth. These flows occur at closed magnetic field lines. The cause and effect relationship between fast earthward plasma flows in the distant tail and substorm activity suggests that a neutral line can form at distances far beyond 100RE during quiet conditions.

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