Substorm inner plasma sheet particle reduction

Details Substorm inner plasma sheet particle reduction Substorm inner plasma sheet particle reduction

Publishing date

Dec 2003

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1426l&link_type=abstract

Journals

Journal of Geophysical Research, Volume 108, Issue A12, pp. SMP 9-1, CiteID 1426, DOI 10.1029/2003JA010177

Science

Physics

Additional info 2

19

Additional info 3

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Auroral Phenomena (2407), Ionosphere: Ionosphere/Magnetosphere Interactions (2736)

Type

Scientific paper

Abstract

Geotail measurements from within the equatorial inner plasma sheet at r ~ 10-13 RE are used to show that a reduction in equatorial plasma pressure within the current wedge is a general feature of substorms and that this decrease is simultaneous with the well-known expansion phase increase in energetic particle fluxes. The decrease in pressure is found to be due to a decrease in particle fluxes at lower energies that gives a significant decrease in plasma density. We also find that when viewed as a function of the adiabatic energy invariant for the plasma sheet λ, there is a reduction in the number of particles for all λ despite the enhancements seen when energetic particle fluxes are viewed at fixed particle energy. These observations demonstrate that the expansion phase is associated with a significant reduction in flux tube content of particles within the current wedge and that this reduction leads to the expansion-phase reduction in equatorial plasma pressure and cross-tail current.

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