Effects of Soft Electron Precipitation on the Coupled Magnetosphere-Ionosphere-Thermosphere

Details Effects of Soft Electron Precipitation on the Coupled Magnetosphere-Ionosphere-Thermosphere Effects of Soft Electron Precipitation on the Coupled Magnetosphere-Ionosphere-Thermosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm42a..05z&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM42A-05

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2455] Ionosphere / Particle Precipitation, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling

Scientific paper

Global simulations play an important role in understanding the coupled magnetosphere-ionosphere-thermosphere (MIT) system. The MIT interaction involves both electrodynamic and plasma transport processes, and it is influenced by precipitating particles that deposit both thermal and kinetic energy from the magnetosphere in the ionosphere-thermosphere. Currently, global simulation codes do not include soft electron precipitation, which can significantly influence the thermospheric and ionospheric structure. In this study, two types of causally specified soft electron precipitation, direct-entry cusp and broadband electron precipitation, are implemented in the Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model. The direct entry cusp electron precipitation is modeled by specifying the electron thermal flux and temperature in a dynamically determined cusp area. The broadband electron precipitation is regulated by the downward Alfvenic Poynting flux based on empirical relations from Polar and FAST satellite data. Simulation results show that while both types of soft electron precipitation have only minor effects on the ionospheric conductance, they can significantly modify the plasma distribution in the F-region ionosphere and the neutral density in the thermosphere.

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