AAS 204th Meeting, June 2004
Session 29 The Solar Corona and Beyond
SPD Oral, Monday, May 31, 2004, 2:00-3:30pm, 702

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[29.01] A Soliton Solution for the Solar Corona: ``EIT Waves'' Explained

M.J. Wills-Davey, C.E. DeForest (SwRI), J.O. Stenflo (SwRI, on leave from Inst. of Astronomy, Univ. of Zurich)

Many aspects of ``EIT wave'' observations have proved incongruous with linear, plane-wave solutions. We find that solitons, rather than plane waves, produce a viable non-linear MHD solution for a single-pulse coronal compression wave. Aspects of the soliton solution describe properties of EIT waves, in particular: \begin{itemize} \item coherence and integrity over large distances, \item propagation velocities that can be substantially slower than expected Alfvén or fast-mode speeds, and \item displacements that can potentially instigate loop oscillations. \end{itemize} Additionally, this solution's very non-linearity may explain why EIT waves are so strongly correlated with coronal mass ejections. This research was funded by a grant from NASA.

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