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Abstract: It was shown in [M.A. Lee, V.D. Shapiro, R.Z. Sagdeev, J. Geophys. Res. 101 (1996) 4777] that one of the limits to the shock surfing acceleration of ions at quasiperpendicular shocks is because of the obliqueness of the shock wave. In this Letter, a critical obliqueness is found for the relativistic shock wave, below which the energy gain of the particle due to the shock surfing acceleration is not limited by the obliqueness of the shock wave. [Copyright &y& Elsevier]

The modulational interaction of very short wavelength lower-hybrid waves with slow density modulations associated with inertial Alfven mode is investigated. Nonlinear equations governing this interaction are derived and soliton-like solutions of these equations are discussed in the context of auroral ionosphere. [Copyright &y& Elsevier]

Describes numerical solutions of Zakharov-type equations for lower-hybrid (LH) waves, including pumping at the long wavelengths and dissipation at short wavelengths in the form of dissipative cavitons. Quasistationary structure undergoing many sequences of collapse due to dissipation; Ion-wave interactions; Possibility of trapping of short-wavelength LH oscillations.

Proposes an analytical model of the tilting instability that exhibits inverse cascade phenomenon, conserving both energy and enstrophy. View that tilting instability is an instability of convective motions two-dimensional ideal fluid transforming convection into sheared flow; Evolution of the nonlinear stage in which initial fluid convection is transformed completely into the large-scale flow.