Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21a1534b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA21A-1534
Physics
2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2788 Magnetic Storms And Substorms (7954), 7944 Ionospheric Effects On Radio Waves
Scientific paper
The stormtime development of equatorial plasma bubbles (EPBs) and neutral densities in the thermosphere are coupled through the histories of imposed magnetospheric electric fields. Periods of intense EPB activity driven by penetration (EM) fields in the main phase are followed by their worldwide absence during recovery. A new method is applied to estimate global thermospheric energy (Eth) budgets from orbit-averaged densities measured by accelerometers on polar-orbiting satellites. During the main phase of storms Eth increases while the stormtime electric field is operative, then exponentially decays toward quiet-time values in the early recovery phase. Some fraction of the energy deposited at high magnetic latitudes during the main phase propagates into the sub-auroral ionosphere-thermosphere and affects chemical and azimuthal-wind dynamics well into recovery. We suggest a scenario wherein fossils of main-phase activity inhibit full restoration of quiet-time dayside dynamos and pre-reversal enhancements of upward plasma drifts near dusk denying bottomside irregularities sufficient time to grow into EPBs.
Burke William J.
Huang Chang-Yin
Sharma Ramesh D.
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