Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1652z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1652
Other
2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling
Scientific paper
The effects of primary electron precipitation are included in global simulation models of the magnetosphere-ionosphere interaction, with the basic properties of the precipitation usually derived from MHD variables characterizing the magnetospheric plasma. In this study, the electron precipitation model is extended to include secondary and degraded primary electrons as well as the usual primary electron population. The spectrum of the secondaries and degraded primaries is modeled following Evans (1974). We have implemented this model in the Lyon-Fedder-Mobarry (LFM) global model. Simulation results show that the precipitating number flux is increased dramatically by secondary electrons. Other ionosphere variables such as electron average energy, Peterson and Hall conductances are influenced by secondary electron precipitation as well, with polar cap potential and field-aligned current less affected. Although these extensions to the electron precipitation model have a minor effect on the electrodynamics of the magnetosphere-ionosphere interaction in the standalone LFM model, they are expected to modify the state of the F-region ionosphere more significantly, e.g., when the LFM model is coupled to a thermosphere-ionosphere general circulation model such as the NCAR TIEGCM. Evans, D. S., Precipitating electron fluxes formed by a magnetic field-aligned potential difference, J. Geophys. Res, 79, 19, 2853, 1974
Brambles O. J.
Damiano Peter A.
Lotko William
Zhang Baigang
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