Reconstruction of Plasma Pressure Gradients in the Plasma sheet and Their Relationship to The Substorm Dynamics

Details Reconstruction of Plasma Pressure Gradients in the Plasma sheet and Their Relationship to The Substorm Dynamics Reconstruction of Plasma Pressure Gradients in the Plasma sheet and Their Relationship to The Substorm Dynamics

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31c..06a&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31C-06

Physics

2407 Auroral Ionosphere (2704), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

Analysis of particle precipitating fluxes obtained by Aurel-3 satellite made it possible the reconstruction of plasma pressure in the plasma sheet. Tsyganenko 96 model, sensitive to the solar wind conditions, was used for mapping of plasma parameters from ionosphere to the equatorial plane and for the estimation of the magnetic flux tube volume per unit flux associated to corresponding field line. Evolution of radial plasma pressure profiles for different phases of isolated geomagnetic storms was studied. Observed profiles apparently are not sharp enough to develop interchange related to radial plasma pressure gradients. Instability related to the existence of the azimuthal plasma pressure gradients is proposed. The increment of instability is higher in the region of upward field-aligned current, where the existing field-aligned potential drop leads to magnetosphere-ionosphere decoupling. Therefore the study of auroral electron precipitations is important for the localization of the substorm onset.

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