TRIGGER MECHANISMS FOR THE RAPID GENERATION AND REFEEDING OF A TORNADO-CYCLONE

Abstract

There exist purely hydrodynamic models for tornado-cyclone, i.e. rotating under the action of Coriolis forces thundercloud from which tornado funnels usually form. However there are known superfast cases of appearing tornado-cyclone and its replenishment with ascending vortices of degassing nature which were described in a famous monograph by D.V. Nalivkin and were observed over the Amur Bay on 20.09.1997 near Vladivostok. For modelling similar degassing generated tornado-cyclones in a quasistationary stage it is convenient to use magneto-hydrodynamic analogy between the equations system of equilibrium magneto-hydrodynamic configurations in the theory of controlled thermonuclear fusion for the pair {magnetic field – electric current} and the pair {velocity – vorticity} in case of steady ideal incompressible fluid currents. Like tornado-cyclone model is suggested basing on algebraic Grad –
Shafranov equation solution for tokamak with D-shaped section; when tokamak magnetic surfaces equation allow determine magnetic field and electric current distribution and then derive similar formulas for velocity and vorticity fields in tornado-cyclone using magneto-hydrodynamic analogy. In order to complete this model, one should place an ascending column-shaped vortex into the central tornado-cyclone zone taking into account pressure equality on external side of this degassing vortex and on internal torus border.