a1 Ecole Polytechnique Fédérale de Lausanne, Switzerland
a2 Ecole Polytechnique Fédérale de Lausanne, Switzerland, and Plasma Physics Laboratory, Princeton University, Princeton, N.J. 08540
a3 Ecole Polytechnique Fédérale de Lausanne, Switzerland
Magnetic shear is found to have a strong effect on the propagation characteristics of the lower hybrid parametric daughter waves but no significant effect on the pump wave. The analysis of the OTS instability shows that the convective damping introduced by magnetic shear acts on a distance L H(me/mi)½, where H is the magnetic shear scale length. There are two regimes for the convective damping, depending on the wavelength of the parametric daughter waves. For small wavelengths the growth rates are linear functions of (kL)-1. For large wavelengths the growth rates are exponentially decreasing functions of (kL)-1.
(Received May 16 1978)
(Revised October 06 1978)
p1 Present address: School of Electrical Engineering, Cornell University, Ithaca, NY 14853.
‡ Permanent address: Hunter College/CUNT, New York, NY 10021.