PROGRAM: S-1

Title:

UTILIZATION OF A SUITE OF GROUND-BASED AND SPACE BASED DATA WITH THE AID OF MAGNETOHYDRODYNAMIC SIMULATION TO UNDERSTAND SOLAR ERUPTIVE EVENTS AND INITIATION OF CORONAL MASS EJECTIONS (CME)

S T Wu (1933-2017)

Center For Space Plasma and Aeronomic Research and Department of Mechanical and Aerospace Engineering, The University of Alabama in Huntsville, Huntsville

Abstract:

It is well-known that solar eruptions are the major drivers of space weather. Physically, solar eruptions are explosive releases of excess magnetic energy of the Sun's corona (coronal mass ejection). Here we will use a suite of observations together with magnetohydrodynamic simulation to initiate and verify a solar eruptive event that leads to a CME. The suite of observations includes the ground based as well as space based observations. The ground based observations from Stanford Synoptic map and SOLIS magnetic field measurements are used to construct the undisturbed solar wind. The active region magnetogram from SDO/HMI is used to construct the dynamical evolution of the coronal magnetic field using our very well tested 3D Magnetohydrodynamic Data-Driven Active Region Evolution (MHD-DARE) model (Jiang, et al. 2016; Wu et al. 2006) and these simulated magnetic field configurations will be verified by using SDO/AIA images. Then, these outputs will be introduced to the 3D MHD global corona-heliosphere evolution (3D MHD-GCHE) model (Feng, Zhou and Wu, 2007, Wu et al. 2016) to investigate the CME initiation and its outputs will be compared with STEREO/CORE-1 data to verify the CME initiation. We have selected Active Region 11283 to illustrate this formalism by using our 3D MHD-DARE model and 3D MHD-GCHE model for solar eruption and CME initiation verified by STEREO-COR-1.

In summary, this investigation of solar eruption leading to CME initiation is quite different from current simulations. We have used an observed unstable flux-rope obtained from magnetograms of HMI/SDO with our MHD-DARE model and inserted this flux-rope into our 3D MHD-GCHE model to track the propagation for the initiation of the CME. The results revealed that the simulated CME images match the STEREO/COR-1 image well. Further, it also showed the possible location of a solar energetic particle event (SEP).

References:

Feng, X. S., Y. F. Zhou, and S.T. Wu, (2007) "A novel numerical implementation for soalr wind modelinn g by the modified conservation element/solution element method" Ap.J. vol 6555(2) pp 1110-1126

Jiang, C. W, S. T. Wu, X. S. Feng, and Q. Hu, (2016) "Data-driven magnetohydrodynamic modelling of a flux-emerging active region leading to solar eruption", Nature Comm. Vol. 7(11522) doi:10.1038/ncomms11522

Wu, S. T., A. H. Wang, Yang Liu and Todd Hoeksema, (2006) "Data Driven Magnetohydrodynamic (MHD) Model for Active Region (AR) Evolution" Ap. J., Vol. 652(1), pp 800-811, doi:https://doi.org/10.1086/55 07864

Wu, S. T., Yufen Zhou, C. W. Jiang, X. S. Feng, C. C. Wu and Q. Hu, (2016) "A data-constrained three-dimensional magnetohydrodynamic simulation model for a coronal mass ejection initiation" J. Geopp hys. Res., Vol 121(2), pp 1009-1023, doi:10.1002/2015JA021615

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