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The stability characteristics of a plasma jet V(x) = sech{2} x embedded in a parallel magnetic field B(x) = B(o) tanh x are investigated. The Kelvin-Helmholtz kink mode, which dominates at small B(o), is stabilized at B(o) = 0.46, while the pinch mode remains unstable up to B(o) = 0.96. Contrary to a nonmagnetized jet, for finite B(o) the kink mode saturates quasilinearly by broadening the jet, such that B(o)/V(max) becomes larger than the marginal value 0.46. Including finite resistivity the nonlinear behaviour is eventually governed by the tearing mode for all values of B(o) does not equal 0, consisting of a single plasmoid moving along the jet. Hence the shear flow cannot stabilize the tearing mode, so that the apparent tearing stability of resistive current sheets observed in numerical simulations of magnetic reconnection is only due to finite-length effects.

Additional information

Authors: BISKAMP D, Max-Planck-Insstitut für Plasmaphysik, Garching bei München (DE);SCHWARZ E, Max-Planck-Insstitut für Plasmaphysik, Garching bei München (DE);ZEILER A, Max-Planck-Insstitut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Physics of Plasmas Vol. 5 (1998) No. 7, pp. 2485-2488
Record Number: 199811304 / Last updated on: 1998-10-27
Original language: en
Available languages: en