HAO Colloquium - Kevin Pham, HAO

The Importance of Coupled Magnetosphere-Ionosphere-Thermosphere Modeling

Geospace consists of many interdependent regions that are oftentimes considered on their own but when coupled together, they allow for new and important interaction pathways.  Prior works to couple the magnetosphere-ionosphere-thermosphere together have mostly considered the electrodynamic pathway.  An additional pathway that exchanges mass is introduced through the coupling of the Ionosphere Polar Wind Model (IPWM) to the existing NCAR Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model which couples NCAR’s Thermosphere-Ionosphere-Electrodynamic General Circulation Model (TIEGCM) to the Lyon-Fedder-Mobarry (LFM) magnetosphere model.  This new pathway allows for the thermosphere to influence the magnetosphere through mass exchange.  Results from a set of numerical experiments will be shown that illustrate the extent to which the thermosphere influences the magnetosphere through this pathway.  Additionally, the NCAR CMIT model has been improved by replacing the legacy magnetosphere model with the next generation magnetosphere that includes a more tightly coupled ring current model.  Results from the upgraded CMIT model show more realistic traveling atmospheric disturbances (TADs) that are captured by satellite observations and underestimated or even missed by the standalone TIEGCM. 

Date and time: 
Wednesday, November 18, 2020 - 2:00pm to 3:00pm