DISTRIBUTION OF PARAMETERS OF PLASMA AND MAGNETIC FIELD ACROSS RECONNECTION LAYER. COMPARISSION MHD MODELING WITH THE ANALITICAL SOLUTION : материалы временных коллективов

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: Magnetic reconnection is universal plasma process which is responsible for solar flares, magnetospheric substorms and solar wind - magnetosphere coupling. In the course of reconnection two outflow regions with accelerated plasma are formed. Magnetic reconnection occurs very often in asymmetric current layers which separate two plasmas with different parameters. When reconnection started, the current layer breaks up to a system of MHD discontinuities such as Alfve'n discontinuities, slow shocks, and contact discontinuities. Between them MHD parameters (plasma speed, magnetic field, plasma density and temperature) are constant if initial current sheet can be considered as tangential discontinuity. The problem about decay of tangential discontinuity is known as Riemann problem which can be solved analytically for the case of weak reconnection. In reality an initial current layer has some internal structure and finite thickness. Therefore there is a question on applicability of the theory (analytical solution). To outline the boundary of applicability it is necessary to compare MHD simulation to the analytical solution. The MHD parameters obtained from the solution of the Riemann problem have been compared with the result of MHD simulation of asymmetric reconnection. After some initial period which is necessary for MHD discontinuities to be formed, comparison shows rather good agreement.

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Издание

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

Номера страниц: 241-246

Место издания: ST PETERSBURG

Издатель: ST PETERSBURG STATE UNIV, FAC PHYSICS

Авторы

  • Sasunov Yu. L. (St Petersburg State Univ, St Petersburg 198504, Russia)
  • Erkaev N.V. (Russian Acad Sci, Siberian Branch, Inst Computat Modeling, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Semenov V.S. (St Petersburg State Univ, St Petersburg 198504, Russia)
  • Vinnikova E.O. (St Petersburg State Univ, St Petersburg 198504, Russia)
  • Heyn M.F. (Graz Univ Technol, Inst Theoret Phys, Graz, Austria)
  • Biernat H.K. (Austrian Acad Sci, Space Res Inst, Graz, Austria; Graz Univ, Inst Phys, A-8010 Graz, Austria)

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