Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa33a1064h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA33A-1064
Physics
2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 2788 Magnetic Storms And Substorms (7954)
Scientific paper
During the magnetic storm of 9 - 11 November 2004, the polar-orbiting DMSP, CHAMP and GRACE satellites sampled ionospheric and thermospheric responses at local times extending from dusk into the post-midnight sector. We compare Poynting fluxes measured by sensors on four DMSP satellites on 10 November with those predicted by the Weimer model. Both show intermittent, peak energy deposition rates of 80 mW/m**2. during the day. Neutral densities inferred from the accelerometers on CHAMP and GRACE showed remarkably fast increases during times when Poynting fluxes were high. This suggests that rapid coupling between ions and neutrals leads to fast changes in thermospheric densities during storms, behavior not captured by current models. Further, local neutral density maxima are seen to progress from high to low latitudes on orbit-to-orbit time scales, suggesting that stormtime winds transport much of the deposited energy from the auroral oval towards the equator.
Burke William J.
Huang Chang-Yin
Weimer Daniel R.
Wilson Gordon Ray
Wise John O.
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