Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm43b1324b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM43B-1324
Physics
2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms
Scientific paper
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.
Bryant C. R.
Donovan Eric F.
Mende Stephen B.
Murphree John S.
Weygand J.
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