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Theory and observation of double discontinuities
Catholic University of America, Room 107, Pangborn Hall, Washington, D. C. 20064, USA
Abstract. Recent research using high-resolution magnetic field data to examine the interior structures of MHD shocks in interplanetary space and in the magnetotail led to a surprising discovery that a slow-mode shock is often followed by an adjoining rotational discontinuity layer on the postshock side. The thickness of each layer is of the order of a few ion inertial lengths. Such a compound structure is known as a double discontinuity. When the magnetic field rotates by several degrees per ion inertial length inside a thin layer, the Hall current term becomes important in the generalized Ohm's law. Steady state solutions based on the Hall-MHD theory have been obtained to show the merging of a rotational layer and a slow shock layer to form a compound structure like the observed double discontinuities.
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Citation: Whang, Y. C.: Theory and observation of double discontinuities, Nonlin. Processes Geophys., 11, 259-266, 2004. Bibtex EndNote Reference Manager
