HR: 1330h
AN: SM32A-1134    [PDF]
TI: Timing of Substorm Signals in the Plasma Sheet and the Auroral Region
AU: * Wang, X
EM: xywang@physics.auburn.edu
AF: Auburn University, Physics Department 206 Allison Lab, Auburn, AL 36849 United States
AU: Perez, J D
EM: perez@physics.auburn.edu
AF: Auburn University, Physics Department 206 Allison Lab, Auburn, AL 36849 United States
AU: Jahn, J
EM: jjahn@swri.edu
AF: Southwest Research Institute, Space Science Lab 6620 Culebra Rd, San Antonio, TX 78238 United States
AU: Pollock, C J
EM: CPollock@swri.edu
AF: Auburn University, Physics Department 206 Allison Lab, Auburn, AL 36849 United States
AU: Valek, P
EM: PValek@swri.edu
AF: Southwest Research Institute, Space Science Lab 6620 Culebra Rd, San Antonio, TX 78238 United States
AU: C:son Brandt, P
EM: brandpc1@jhuapl.edu
AF: The Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 United States
AU: Mitchell, D G
EM: Donald.G.Mitchell@jhuapl.edu
AF: The Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 United States
AU: Mende, S B
EM: mende@ssl.berkeley.edu
AF: University of California, Berkeley, Space Sciences Laboratory Centennial Drive at Grizzly Peak Blvd., Berkeley, CA 94720 United States
AB: 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.
DE: 2704 Auroral phenomena (2407)
DE: 2760 Plasma convection
DE: 2764 Plasma sheet
DE: 2788 Storms and substorms
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting