Effects of MHD slow shocks propagating along magnetic flux tubes in a dipole magnetic field

Тип публикации: статья из журнала

Год издания: 2002

Ключевые слова: magnetohydrodynamics, plasma

Аннотация: Variations of the plasma pressure in a magnetic flux tube can produce MHD waves evolving into shocks. In the case of a low plasma beta, plasma pressure pulses in the magnetic flux tube generate MHD slow shocks propagating alone, the tube. For converging magnetic field lines, such as in a dipole magnetic field, the cross section of the magnetic flux tube decreases enormously with increasing magnetic field strength. In such a case, the propagation of MHD waves along magnetic flux tubes is rather different from that in the case of uniform magnetic fields. In this paper, the propagation of MHD slow shocks is studied numerically using the ideal MHD equations in an approximation suitable for a thin magnetic flux tube with a low plasma beta. The results obtained in the numerical study show that the jumps in the plasma parameters at the MHD slow shock increase greatly while the shock is propagating in the narrowing magnetic flux tube. The results are applied to the case of the interaction between Jupiter and its satellite Io, the latter being considered as a source of plasma pressure pulses.

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Издание

Журнал: Nonlinear Processes in Geophysics

Выпуск журнала: Vol. 9, Is. 2

Номера страниц: 163-172

ISSN журнала: 10235809

Авторы

  • Erkaev N.V. (KRASNOYARSK STATE UNIV)
  • Shaidurov V.A. (KRASNOYARSK STATE UNIV)
  • Semenov V.S. (KRASNOYARSK STATE UNIV)
  • Biernat H.K. (KRASNOYARSK STATE UNIV)

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