[IGPP Everyone] TODAY: AOS270 Seminar, 3:30pm: Model Simulation of the Coupled Thermosphere-Ionosphere System (T.-W. Fang, CIRES, CU Boulder)

[Emmanuel V. Masongsong]

Department of Atmospheric and Oceanic Sciences Seminar 
AOS 2 70 



Wednesday, March 4, 2015 


3:30 PM to 4:30 PM 

Math Sciences 7124A 





Tzu-Wei Fang 

Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado, USA. 



“Model Simulation of the Coupled Thermosphere-Ionosphere System ” 



Abstract 



The Earth’s upper atmosphere, comprised of the ionosphere and thermosphere, is where neutral and charged particles interact and cause complicated physical processes. The densities of charged particles show significant variations with altitude, latitude, longitude, time, season, solar cycle, and geomagnetic activity. These variations result from changes in the solar radiation, the coupling and feedback mechanisms between the ionosphere-thermosphere system, tides and waves in the mesosphere, and magnetosphere. In the low latitude ionosphere, the nearly horizontal geomagnetic field lines combine with the neutral wind and electric field to create some unique phenomena. This talk will demonstrate several coupling schemes between the lower atmosphere and the upper atmosphere using state-of-the-art models of thermosphere and ionosphere, including the NOAA Whole Atmosphere Model (WAM), NCAR Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM), the Global Ionosphere and Plasmasphere (GIP), and the Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics (CTIPe). Different types of model couplings provide us with climatology of the upper atmosphere and help us in investigating phenomena due to particular events. Simulation results of low-latitude ionospheric phenomena including the ionospheric responses to Sudden Stratospheric Warming events, longitudinal structures seen in the equatorial ionosphere, and day-to-day variability of the ionosphere, and ionospheric responses to thermospheric midnight temperature maximum will be discussed. 


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