Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa14a..08k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA14A-08
Physics
[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [3369] Atmospheric Processes / Thermospheric Dynamics, [7969] Space Weather / Satellite Drag
Scientific paper
During 2005 solar EUV energy input to the thermosphere waned as Solar Cycle 23 declined. The reduction allowed a clearer delineation of episodic density disturbances caused by geomagnetic storms. We show new views of these disturbances based on Poynting flux calculations from the Defense Meteorological Satellite Program (DMSP) F-series satellites, as well as from 1) accelerometer data from polar orbiting satellites, 2) the assimilative mapping of ionospheric electrodynamics (AMIE) procedure and 3) the Thermospheric Ionospheric Electrodynamic General Circulation Model (TIEGCM). The new Poynting flux estimates and TIEGCM results allow us to trace the origins of disturbances that are poorly specified by ground indices. In particular we find that intervals of enhanced northward Interplanetary Magnetic Field (IMF) combined with strong east-west components of the IMF allow significant electromagnetic energy input into localized dayside regions of the high-latitude thermosphere. In some cases this energy deposition is consistent with IMF-geomagnetic field merging tailward of the Earth’s magnetic cusps. In other cases the energy is deposited in the vicinity of an extremely narrow convection throat. This mode of interaction provides little energy to the magnetotail; and instead concentrates the energy in the dayside thermosphere. We discuss the solar cycle variability of this type of interaction. as well as compare the relative value of Poynting flux and particle energy deposition for such events.
Crowley Geoff
Drake Kelly Ann
Knipp Delores J.
Lei Jing
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