Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.57s&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
We present the results of a parametric study on the initiation and early evolution properties of Coronal Mass Ejections (CMEs). Our mathematical model is based on the breakout model which we embedded in a 2.5D axisymmetric solar wind in the framework of numerical ideal magnetohydrodynamics (MHD). The initial results used as a basis for this parametric study were published by B. van der Holst et al. (2007). In this paper the authors describe how the initial, steady equilibrium containing a pre-eruptive region consisting of three arcades with alternating magnetic flux polarity and correspondingly three neutral lines on the photosphere can produce a CME by shearing part of the central arcade. They conclude that the breakout CME propagation through the solar wind consists of two major phases. The original breakout model phase closely follows the scenario described by Antiochos et al. (1999). However, at a certain moment the breakout reconnection, on the leading edge of the rising central arcade and a flare reconnection below, stops and two new reconnections spots are formed on the flanks of the erupting central arcade. These ultimately disconnect the top of the overlying helmet streamer from the Sun. We investigate the influence of the magnetic field strength and size of the central arcade on the CME velocity and look at the effect of changing the sheartime or shear velocity. The effect of the background solar wind model on these simulations is also investigated. The results of changes to these parameters are analyzed by looking at their effect on properties like current density, relative density, kinetic and magnetic energy, and helicity.
der Holst Bart van
Poedts Stefaan
Soenen Alexander
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