SAPS measurements around the magnetic equator by CRRES

Details SAPS measurements around the magnetic equator by CRRES SAPS measurements around the magnetic equator by CRRES

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510104n&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 10, CiteID L10104

Physics

10

Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Ionosphere: Plasma Convection (2760), Ionosphere: Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

Enhancements of convection electric fields during two substorms have been analyzed using CRRES satellite data measured in the premidnight inner magnetosphere. The electric field, related to subauroral polarization streams (SAPS), begins to increase within 30 sec after the substorm onset, indicating a quicker response of convection in the inner magnetosphere to substorms than has been reported (~10 min) before. A prompt response of the ion pressure and the following decrease in the cold plasma density supports the fact that the electric field enhances just after the substorm onset and drives accelerations of energetic ions and plasmapause erosion. The SAPS electric field enhances between the earthward edges of the ring current and plasmasheet, and the plasmapause coincides with the earthward edge of the electron plasmasheet. The plasmapause location deviates from the stagnation point, and the SAPS electric field penetrates into the plasmasphere, driving a sunward plasma drift of the plasmaspheric plasma.

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