Using the WKB approximation, the propagation of fast magnetoacoustic waves close to a Y-point of a current sheet is analyzed. When the presence of a small (of order ε), uniform magnetic field Bxparallel to the current, with the role of a perturbation, is taken into account, weak chaos of the ray trajectories is found. The properties of the system are then analyzed by means of a mapping of the Poincaré section. It is found that the region of stochasticity for very small ε fills almost the whole phase space, and decreases with increasing ε.
|Pages (from-to)||138 - 141|
|Number of pages||4|
|Publication status||Published - 1998|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Mathematical Physics
- Condensed Matter Physics