Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh22d..03m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH22D-03
Physics
7513 Coronal Mass Ejections, 7524 Magnetic Fields
Scientific paper
We present a three-dimensional (3D) numerical ideal magnetohydrodynamics (MHD) model describing the time-dependent expulsion of a CME from the solar corona propagating all the way to 1 A.U.. The simulations are performed using the BATS-R-US (Block Adaptive Tree Solarwind Roe Upwind Scheme) code. We begin by developing a global steady-state model of the corona that possesses high-latitude coronal holes and a helmet streamer structure with a current sheet at the equator. The Archimedian spiral topology of the interplanetary magnetic field is reproduced along with fast and slow speed solar wind at high and low latitudes respectively. Within this model system,we drive a CME to erupt by the introduction of a twisted magnetic flux rope that is anchored at both ends in the photosphere and embedded in the helmet streamer. The flux rope configuration that we employ was first developed by Gibson and Low as part of a 3D self-similar model of a CME. In this case, the flux rope has the form of a spherical ball of twisted magnetic field distorted to a tear shape by a stretching transformation. The stretch transformation produces an outward radially directed Lorentz force within the flux rope that rapidly accelerates the leading edge of the rope to speeds of 1800 km/sec, driving a strong shock as part of the CME. We follow the evolution of the CME from the low corona as it makes its way through the heliosphere. We explore the dynamics of the expanding flux rope as it interacts with the rotating, bi-modal solar wind to determine significant MHD effects. Finally we present synthetic white-light coronagraph images of the model CME which show a three-part structure that can be compared with observations of CME structure.
Dezeeuw Darren
Gombosi Tamas
Manchester Ward B.
Opher Merav
Powell Keith
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