Large electric fields near the nightside plasmapause observed by the Polar spacecraft

Details Large electric fields near the nightside plasmapause observed by the Polar spacecraft Large electric fields near the nightside plasmapause observed by the Polar spacecraft

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11a1557k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM11A-1557

Physics

[2768] Magnetospheric Physics / Plasmasphere

Scientific paper

We report the observation of large amplitude electric fields when the Polar spacecraft passed the plasmapause, which is identified as a boundary between cold (plasmasphere) and hot (plasma sheet) plasmas, near the midnight. These electric fields were observed during the substorm recovery phase. They are predominantly perpendicular to the ambient magnetic field and accompanied by a negative-then-positive magnetic field perturbation. That is, the magnetic field is reduced outside the plasmapause and enhanced inside the plasmapause. The field variations are dominant in the radial components (Bx and Bz) rather than the azimuthal component (By). It may be due to the dawnward plasmapause current, which is caused by the balance of forces (▽P ~ J×B) at the plasmapause, perpendicular to the magnetic field. The large electric fields localized near the plasmapause may be due to the interaction between hot plasma sheet plasmas and cold plasmaspheric plasmas.

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