Separating Sources of Storm-Time Electrodynamics Using Physical Models and Observations

Details Separating Sources of Storm-Time Electrodynamics Using Physical Models and Observations Separating Sources of Storm-Time Electrodynamics Using Physical Models and Observations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa44a..01f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA44A-01

Other

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 7949 Ionospheric Storms (2441), 7954 Magnetic Storms (2788)

Scientific paper

Interpretation of observations of the electrodynamic response to geomagnetic storms is relatively unambiguous during the first two to three hours of the onset of an event. During these early hours, penetration electric fields dominate. After this time, other processes begin to influence the response, such as the disturbance dynamo. Modeling real events reveals that dynamo processes can cause an electrodynamic response at the equator within two to three hours of storm onset. Confirmation of the modeling results can only be achieved by observing both the electrodynamic response and the time evolution of the dynamics, which is the cause of the disturbance dynamo. The ionospheric response to a storm at mid and low latitude is further complicated by a range of additional physical processes, in particular changes in ion recombination rates due to altered neutral thermospheric composition. To separate the influence of electrodynamic and the neutral atmosphere requires, in addition, knowledge of the neutral composition response.

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