Upper-Hybrid Solitons and Oscillating-Two-Stream Instabilities.

摘要

A warm two-fluid theory of soliton formation near the upper-hybrid frequency is developed. Several forms of the nonlinear Schrodinger equation are obtained, depending on whether the electric field is completely perpendicular to the dc magnetic field or whether it has an additional small component parallel to the magnetic field. For the perpendicular case, the character of the soliton depends on its scale length, L, and on beta. For low beta, when L > c omega sub pe prime stationary envelope and hole solitions are found, whereas in the limit L > c omega sub pi the super-Alyenic solitons described magnetohydromagnetically by Kaufman and Stanflo are obtained. However, the case E is parallel to or equal to O may be of more interest, since it couples the pump to the excited waves more efficiently. In the limit of linearization about an infinite wavelength pump, the nonlinear Schroedinger equations yeild purely growing (oscillating-two-stream) instabilities in both cases.