Sub-Auroral proton precipitation as a Result of Plasmapause-Ring-Current Interaction

Details Sub-Auroral proton precipitation as a Result of Plasmapause-Ring-Current Interaction Sub-Auroral proton precipitation as a Result of Plasmapause-Ring-Current Interaction

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm31a..04f&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM31A-04

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2768 Plasmasphere, 2778 Ring Current

Scientific paper

The proton aurora imager SI-12 on the IMAGE spacecraft occasionally observes subauroral proton precipitation in the morning and the afternoon sectors. Sub-auroral Morning Proton Spots (SAMPS) rotate with 80-90% of the Earth's corotation speed, while the detached afternoon proton arcs do not move in local time. Coincident particle measurements by DMSP of both phenomena confirm the source as pure high energy precipitating protons with energy likely above the detector limit of 30 keV. The spots appear after magnetic storms in the recovery phase and last for 1-4 hours in the magnetic local time region of 0600-1200 hours. The subauroral arcs appear after a direction change of the southward or westward components of the interplanetary magnetic field. IMAGE-EUV observations of the plasmasphere indicate a relationship with density gradients in the plasmapause. This is supported by nearby geosynchronous observations of increased cold plasma density. We interpret these phenomena as the result of the interaction of ring current protons with electromagnetic ion-cyclotron (EMIC) waves caused by the dense, cold plasmasphere ions. The spots are therefore a consequence of plasmasphere refilling after geomagnetic storms. In contrast, the afternoon arcs are the result of enhanced EMIC waves during moderately disturbed geomagnetic conditions.

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