Propagation of Alfvén surface waves along the ionospheric plasma slab with the effect of gravity

Ionospheric regions connecting the neutral gas atmosphere have been considered to be an incompressible plasma slab surrounded by incompressible plasma on one side and neutral gas on the other side. The effect of gravity on Alfvén surface waves in the slab geometry is studied. As a special case, the propagation of ASW along the plasma-neutral gas interface is also discussed. The existence of two modes of surface waves has been identified and their characteristic behaviour affected by the gravity has been discussed.     

Lattice Variation and Stability of NaCl?KCI Mixed Crystals Grown from Aqueous Solutions

An attempt to improve the stability of NaCl KCl mixed system was made by adding KBr to it. Crystals were grown by the slow evaporation method and characterized by X-ray diffraction measurements. A large improvement in stability was observed with crystals grown from (NaCl)_x (KCl)_0.9−x(KBr)_0.1 than from Na_xK_1−xCl solutions.