Ideal MHD flow behind interplanetary shocks driven by magnetic clouds

Тип публикации: статья из журнала

Год издания: 1995

Ключевые слова: ideal MHD flow, Interplanetary shocks, magnetic clouds, Magnetic barrier, Depletion layer, Sheath, magnetic pressure, cylindrical flux ropes, steady state, nonsteady situations, self-similarly expanding magnetic cloud, nonexpanding magnetic cloud, Bulk motion

Аннотация: Presents an ideal MHD theory to describe the ldquomagnetic barrierrdquo (or ldquodepletion layerrdquo) of that class of interplanetary ejecta called magnetic clouds. By ldquomagnetic barrierrdquo the authors mean that region of the sheath where the magnetic pressure is comparable to, or larger than, the gas pressure and where, therefore, the effects of the magnetic field on the flow are substantial. They model magnetic clouds as cylindrical flux ropes. They consider three cases: one steady state and two nonsteady situations. The two nonsteady situations correspond to (1) a self-similarly expanding magnetic cloud, and (2) to a nonexpanding magnetic cloud which has a net bulk motion with respect to the medium at infinity. In all cases the cloud drives an interplanetary shock ahead of it. The authors describe an algorithm to integrate the MHD equations in which the behavior of the sum of the magnetic and plasma pressure is prescribed. They assume that the sum of the magnetic and plasma pressure is constant along any line normal to the magnetic cloud boundary.

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Издание

Журнал: Journal of Geophysical Research

Выпуск журнала: Т. 100, № А10

Номера страниц: 19919-19931

ISSN журнала: 01480227

Издатель: William Byrd Press for John Hopkins Press

Авторы

  • Erkaev N.V. (Siberian Federal University)
  • Farrugia C.J.
  • Biernat H.K.
  • Burlaga L.F.
  • Bachmaier G.A.

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