SH21B-2403
New Publicly Available EEGGL Tool for Simulating Coronal Mass Ejections.

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Igor Sokolov1, Ward Manchester1, Bart van der Holst2, Tamas I Gombosi3, Meng Jin4, Richard Mullinix5, Aleksandre Taktakishvili6, Anna Chulaki7 and Gabor Toth1, (1)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (2)University of Michigan Ann Arbor, Departament of Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (3)Univ of Michigan, Ann Arbor, MI, United States, (4)Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA, United States, (5)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (6)NASA GSFC, Greenbelt, MD, United States, (7)NASA/GSFC, Greenbelt, MD, United States
Abstract:
We present and demonstrate a new tool, EEGGL (Eruptive Event Generator using Gibson-Low configuration) for simulating CMEs (Coronal Mass Ejections).

CMEs are among the most significant space weather events, producing the radiation hazards (via the diffuse shock acceleration of the Solar Energetic Particles – SEPs), the interplanetary shock waves as well as the geomagnetic activity due to the drastic changes of the interplanetary magnetic field within the “magnetic clouds” ("flux ropes”). Some of this effects may be efficiently simulated using the “cone model”, which is employed in the real-time simulations of the ongoing CMEs at the NASA-Goddard Space Flight Center. The cone model provides a capability to predict the location, time, width and shape of the hydrodynamic perturbation in the upper solar corona (at ~0.1 AU), which can be used to drive the heliospheric simulation (with the ENLIL code, for example). At the same time the magnetic field orientation in this perturbation is uncertain within the cone model, which limits the capability of the geomagnetic activity forecast. The new EEGGL tool http://ccmc.gsfc.nasa.gov/analysis/EEGGL/recently developed at the Goddard Space Flight Center in collaboration with the University of Michigan provides a new capability for both evaluating the magnetic field configuration resulting from the CME and tracing the CME through the solar corona. In this way not only the capability to simulate the magnetic field evolution at 1 AU may be achieved, but also the more extensive comparison with the CME observations in the solar corona may be achieved.

Based on the magnetogram and evaluation of the CME initial location and speed, the user may choose the active region from which the CME originates and then the EEGGL tools provides the parameters of the Gibson-Low magnetic configuration to parameterize the CME. The recommended parameters may be used then to drive the simulation of CME propagation from the low solar corona to 1 AU using the global code for simulating the solar corona and inner heliosphere. The Community Coordinated Modeling Center (CCMC) provides the capability for CME runs-on-request, to the heliophysics community.

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