Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41b..04b&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM41B-04
Mathematics
Logic
2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2760 Plasma Convection, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
It is well known that the Interplanetary Magnetic Field (IMF) is the major contributor to geomagnetic activity on Earth. Recent studies, however, have shown that solar wind dynamic pressure variations cause global effects when they encounter the terrestrial magnetosphere. In particular, it has been shown that solar wind dynamic pressure enhancements significantly increase particle precipitation and cause global intensification of the aurora. Further studies using Defense Meteorological Satellite Program (DMSP) measurements have demonstrated that solar wind pressure increases also significantly affect the cross-polar-cap potential drop. This implies that the dynamic pressure has an important effect on the coupling efficiency between the solar wind and the Earth's magnetosphere, which is in addition to that due to the IMF. It was previously suggested, based on the DMSP data, that solar wind dynamic pressure enhancements induce enhanced magnetotail reconnection and magnetospheric convection. We now present Super Dual Auroral Radar Network (SuperDARN) observations for a number of events that demonstrate significantly enhanced ionospheric convection in the dayside ionosphere associated with the impact of solar wind pressure fronts. The enhanced convection extends to the vicinity of the expected location of the dayside separatrix, suggesting that the solar wind dynamic pressure strongly affects dayside reconnection as well as polar-cap convection.
Anderson Philip C.
Boudouridis Athanasios
Lyons Larry R.
Ruohoniemi Michael J.
Zesta Eftyhia
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