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Sun-to-Earth MHD Simulation of the 14 July 2000 "Bastille Day" Eruption View all abstracts by submitter

Tibor Torok   Submitted: 2018-01-19 08:54

Solar eruptions are the main driver of space-weather disturbances at the Earth. Extreme events are of particular interest, not only because of the scientific challenges they pose, but also because of their possible societal consequences. Here we present a magnetohydrodynamic (MHD) simulation of the 14 July 2000 Bastille Day eruption, which produced a very strong geomagnetic storm. After constructing a thermodynamic MHD model of the corona and solar wind, we insert a magnetically stable flux rope along the polarity inversion line of the eruption's source region and initiate the eruption by boundary flows. More than 1033 ergs of magnetic energy are released in the eruption within a few minutes, driving a flare, an EUV wave, and a coronal mass ejection (CME) that travels in the outer corona at about 1500 km s-1, close to the observed speed. We then propagate the CME to Earth, using a heliospheric MHD code. Our simulation thus provides the opportunity to test how well in situ observations of extreme events are matched if the eruption is initiated from a stable magnetic-equilibrium state. We find that the flux-rope center is very similar in character to the observed magnetic cloud, but arrives about 8.5 hours later and about 15 degrees too far to the North, with field strengths that are too weak by a factor of about 1.6. The front of the flux rope is highly distorted, exhibiting localized magnetic-field concentrations as it passes 1 AU. We discuss these properties with regard to the development of space-weather predictions based on MHD simulations of solar eruptions.

Authors: Tibor Török, Cooper Downs, Jon A. Linker, Roberto Lionello, Viacheslav S. Titov, Zoran Mikić, Pete Riley, Ron M. Caplan, Janvier Wijaya
Projects: None

Publication Status: ApJ (under revision)
Last Modified: 2018-01-23 11:53
Go to main E-Print page  The ?FIP Effect? and the Origins of Solar Energetic Particles and of the Solar Wind  The density compression ratio of shock fronts associated with coronal mass ejections  Edit Entry  Download Preprint  Delete Entry 

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