Volume 527, March 2011
|Number of page(s)||6|
|Published online||24 January 2011|
Downstream structure and evolution of a simulated CME-driven sheath in the solar corona
Institute for the Study of Earth, Oceans, and Space, University of New
2 Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA
3 School of Earth and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China
4 Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143, USA
Accepted: 30 June 2010
Context. The transition of the magnetic field from the ambient magnetic field to the ejecta in the sheath downstream of a coronal mass ejection (CME) driven shock is analyzed in detail. The field rotation in the sheath occurs in a two-layer structure. In the first layer, layer 1, the magnetic field rotates in the coplanarity plane (plane of shock normal and the upstream magnetic field), and in layer 2 rotates off this plane. We investigate the evolution of the two layers as the sheath evolves away from the Sun.
Aims. In situ observations have shown that the magnetic field in the sheath region in front of an interplanetary coronal mass ejection (ICME) form a planar magnetic structure, and the magnetic field lines drape around the flux tube. Our objective is to investigate the magnetic configuration of the CME near the sun.
Methods. We used the space weather modeling framework (SWMF), a 3D magnetohydrodynamics (MHD) simulation code, to simulate the propagation of CMEs and the shock driven by it.
Results. We find that close to the Sun, layer 2 dominates the width of the sheath, diminishing its importance as the sheath evolves away from the Sun, in agreement with observations at 1 AU.
Key words: magnetohydrodynamics (MHD) / magnetic fields / Sun: coronal mass ejections (CMEs)
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.