Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2925p&link_type=abstract
American Astronomical Society Meeting 210, #29.25; Bulletin of the American Astronomical Society, Vol. 39, p.141
Astronomy and Astrophysics
Astronomy
Scientific paper
We present recent results from numerical simulations of the initiation and IP evolution of CMEs in the framework of ideal magnetohydrodynamics (MHD). As a first step, the magnetic field in the lower corona and the background solar wind are reconstructed. Both simple, axi-symmetric (2.5D) solar wind models for the quiet sun as more complicated 3D solar wind models taking into account the actual coronal field through magnetogram data are reconstructed.
In a second step, 2.5D fast CME events are mimicked by superposing high-density plasma blobs on the background wind and launching them in a given direction at a certain speed. In this way, the evolution of the CME can be modeled and its effects on the coronal field and background solar wind studied. In addition, more realistic CME onset models have been developed to investigate the possible role of magnetic foot point shearing and magnetic flux emergence/disppearence as triggering mechanisms of the instability. Parameter studies of such onset models reveal the importance of the background wind model that is used and of the initiation parameters, such as the amount and the rate of the magnetic flux emergence or the region and the amount of foot point shearing.
Last but not least, a simulation of the evolution of a 3D CME and its magnetic cloud superposed on a 3D solar wind model is presented and discussed. In this simulation the CME is mimicked by superposing a magnetic flux rope on top of a stationary background solar wind with extra density and velocity added to the flux rope. The magnetic field inside the initial flux rope is described in terms of Bessel functions and possesses a high amount of twist. Its effect on the evolution of the CME is studied.
Chané Emmanuel
der Holst Bart van
Dubey Govind
Jacobs Carla
Keppens Rony
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