A 2.5D EMHD ANALYTICAL MODEL OF STEADY-STATE HALL MAGNETIC RECONNECTION IN A COLLISIONLESS COMPRESSIBLE PLASMA

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: International Conference on Problems of Geocosmos; St Petersburg, RUSSIA; St Petersburg, RUSSIA

Год издания: 2010

Аннотация: A 2.5D analytical EMHD model of steady-state magnetic reconnection in a collisionless compressible plasma with a constant electron temperature is developed. It is shown that as in incompressible case, the solution of the Grad-Shafranov equation for the magnetic potential is a basis for the problem analysis. The formation of the double electric layers and layers of low density plasma, mapping the magnetic separatrices, are investigated. It is found that formation of depletion layers should not be governed by the out-of-plane magnetic field, but rather, the origin of these layers lies inside the electron diffusion region, where the number density should attain the local minimum due to the inner dissipative processes. The double electric layers are found to be thin separatrices-elongated sheets whose cross-sections are of the order of the electron diffusion region half-width. These charged layers provide the presence of the strong electric field orthogonal to the in-plane magnetic field, which forces electrons to accelerate in the out-of-plane direction. Outside of the double electric layers, the condition of quasi-neutrality of plasma is found to be fulfilled to high accuracy. The extreme values of the electron velocity and electric field are found to be controlled by the width of the electron diffusion region. Thus, last one seems to be the fundamental parameter of the reconnection process.

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Издание

Журнал: PROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE PROBLEMS OF GEOCOSMOS

Номера страниц: 126-131

Место издания: ST PETERSBURG

Издатель: ST PETERSBURG STATE UNIV, FAC PHYSICS

Авторы

  • Korovinskiy D.B. (Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria)
  • Biernat H.K. (Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria; Graz Univ, Inst Phys, A-8010 Graz, Austria)
  • Semenov V.S. (St Petersburg State Univ, St Petersburg 198504, Russia)
  • Erkaev N.V. (Russian Acad Sci, Inst Computat Modeling, Siberian Branch, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Divin A.V. (Katholieke Univ Leuven, B-3000 Louvain, Belgium)
  • Moestl U.V. (Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria)

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