Source distributions of substorm ions observed in the near-Earth magnetotail

Details Source distributions of substorm ions observed in the near-Earth magnetotail Source distributions of substorm ions observed in the near-Earth magnetotail

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..955a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 7, p. 955-958

Physics

15

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Plasma Sheet

Scientific paper

This study employs Geotail plasma observations and numerical modeling to determine sources of the ions observed in the near-Earth magnetotail near midnight during a substorm. The growth phase has the low-latitude boundary layer as its most important source of ions at Geotail, but during the expansion phase the plasma mantle is dominant. The mantle distribution shows evidence of two distinct entry mechanisms: entry through a high-latitude reconnection region resulting in an accelerated component, and entry through open field lines traditionally identified with the mantle source. The two entry mechanisms are separated in time, with the high-latitude reconnection region disappearing prior to substorm onset.

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