Timing of Substorm Signals in the Plasma Sheet and the Auroral Region

Details Timing of Substorm Signals in the Plasma Sheet and the Auroral Region Timing of Substorm Signals in the Plasma Sheet and the Auroral Region

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32a1134w&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM32A-1134

Physics

2704 Auroral Phenomena (2407), 2760 Plasma Convection, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

Both the Medium Energy Neutral Atom (MENA) and High Energy Neutral Atom (HENA) imagers onboard the IMAGE spacecraft have been able to observe ENA emissions from the plasma sheet. The MENA observations showed enhanced emissions associated with high solar wind densities during magnetospheric storm intervals. The HENA observations showed decreases of emissions from the plasma sheet following dipolarization associated with substorms. We present forward modeling of ENA emission from the plasma sheet using the Tsyganenko plasma sheet model. In the model it is found that assuming a flow velocity toward the Earth of the plasma sheet plasma has a strong effect on the strength of the modeled ENA flux. Thus the ENA observations are used to infer the timing of the plasma sheet flow relative to the substorm signal seen in the FUV imager onboard IMAGE.

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