Title: An Overview of Modeling at the Community Coordinated Modeling Center (CCMC) at Goddard Space Flight Center.

Dr. Aleksandre Taktakishvili
Center for Community Coordinated Modeling, NASA Goddard Space Flight Center

Part 1 - Magnetospheric Modeling During prolonged intervals of negative IMF Bz the magnetosphere often enters a state in which quasi-periodic, large-amplitude oscillations of energetic particle fluxes are observed at the geosynchronous orbit. We use the global magnetosphere MHD code BATS-R-US output during a long period of steady southward IMF Bz to drive the Fok Ring Current Model. We use a global magnetosphere MHD code that reproduces fast magnetotail reconnection rates observed in kinetic simulations. This results in periodical loading-unloading cycles in the magnetotail even for steady southward Bz and can explain quasi-periodic oscillations of geosynchronous energetic particle fluxes. The total proton energy within geosynchronous orbit exhibits overall growth in time due to quasi-steady convection and oscillates due to injection through inductive electric fields caused by multiple dipolarizations.

Part 2 - Heliospheric Modeling A cone model-based halo CME representation is inserted into the combined WSA (corona) and ENLIL (heliosphere) models. We studied the performance of the combined models by analyzing different halo CME propagation and evolution to the L1 point and comparing the result to ACE observations. We simulated CMEs related to a number of geomagnetic storms and events, including the series of the October 2003 Halloween Storm CMEs and the fall AGU storm CME on December, 2006. We introduced 4 parameters characterizing cone model performance: CME arrival time, magnitude of impact, magnetopause standoff distance, duration of the event. We also describe real-time setup for the ENLIL cone model to trigger CME alert capability at the Community Coordinated Modeling Center.

UT Arlington Physics