Nonlinear Alfvén waves in extended magnetohydrodynamics

Fully Implicit, Nonlinear 3D Extended Magnetohydrodynamics

Alfvén Waves in the Solar

www.sciencemag.org (this information is current as of August 31, 2007 ): The following resources related to this article are available online at http://www.sciencemag.org/cgi/content/full/317/5842/1192 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/317/5842/1192/DC1 can be fou...

Laboratory observation of a nonlinear interaction between shear Alfvén waves.

An experimental investigation of nonlinear interactions between shear Alfvén waves in a laboratory plasma is presented. Two Alfvén waves, generated by a resonant cavity, are observed to beat together, driving a pseudomode at the beat frequency. The pseudomode then scatters the Alfvén waves, generating a series of sidebands. The observed interaction is very strong, with the normalized amplitude ...

Nonlinear extended magnetohydrodynamics simulation using high-order finite elements

Peak performance for magnetically confined fusion plasmas occurs near thresholds of instability for macroscopic modes that distort and possibly disrupt equilibrium conditions. In some cases, however, the best approach is to exceed stability thresholds and rely upon nonlinear saturation effects. Understanding this behaviour is essential for achieving ignition in future burning plasma experiments...

Alfvén waves in the lower solar atmosphere.

The flow of energy through the solar atmosphere and the heating of the Sun's outer regions are still not understood. Here, we report the detection of oscillatory phenomena associated with a large bright-point group that is 430,000 square kilometers in area and located near the solar disk center. Wavelet analysis reveals full-width half-maximum oscillations with periodicities ranging from 126 to...