HR: 1340h
AN: SM43B-1324 [Abstracts]
TI: Solar Wind and IMF Control of the Recovery Phase of Substorms
AU: * Bryant, C R
EM: bryant@phys.ucalgary.ca
AF: Institute for Space Research
Dept of Physics and Astronomy, University of Calgary
2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
AU: Murphree, J S
AF: Institute for Space Research
Dept of Physics and Astronomy, University of Calgary
2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
AU: Weygand, J
AF: Institute of Geophysics and Planetary Physics
Department of Earth and Space Sciences, University of California, Los Angeles
3845 Slichter Hall
P.O. Box 951567, Los Angeles, CA 90095-1567, United States
AU: Mende, S B
AF: Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA 94720, United States
AU: Donovan, E F
AF: Institute for Space Research
Dept of Physics and Astronomy, University of Calgary
2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
AB:
The IMF and solar wind dynamic pressure can affect the onset location and phenomenon such as transpolar arcs
and the overall substorm process. It is unclear, however, if the IMF, solar wind density and/or dynamic pressure
have any effect on the substorm recovery phase.
Using the IMAGE FUV WIC and SI-12 instruments a selection of 138 isolated substorms was determined. Using
Weimer-mapped ACE IMF and solar wind measurements, the controlling effect on various aspects of the recovery
phase global auroral evolution are examined. In particular, the effect of IMF By component is of interest due to
its significant effect on transpolar arcs and onset location. The results clearly show that there is no significant
effect of the IMF on the recovery phase. There is a tendency for the solar wind density and dynamic pressure to
effect the recovery phase process as manifested in the global aurora. In particular, the proton aurora as
measured with the SI-12 instrument is more heavily influenced by the density and pressure than the largely
electron aurora measured with the WIC instrument.
DE: 2704 Auroral phenomena (2407)
DE: 2784 Solar wind/magnetosphere interactions
DE: 2790 Substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting