The stability, during formation, of magnetohydrodynamic jets collimated by an azimuthal magnetic field

Details The stability, during formation, of magnetohydrodynamic jets collimated by an azimuthal magnetic field The stability, during formation, of magnetohydrodynamic jets collimated by an azimuthal magnetic field

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..245l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 245-256.

Astronomy and Astrophysics

Astronomy

18

Instabilities, Magnetic Fields, Mhd, Galaxies: Jets

Scientific paper

The stability, during formation, of jets is explored using a three-dimensional, non-relativistic, ideal magnetohydrodynamic (MHD) code. An idealized calculation is performed to represent the generic problem of an azimuthal magnetic field pinching a plasma wind from an accretion disc. In particular, the stability of the jets to three-dimensional instabilities (the m=1, helical, instability) is examined. It is found that the pinch effect of an azimuthal magnetic field readily generates a jet. At later times shear, arising from the flow of the jet as it reaches high speeds, appears to cause a reduction in the growth rates. At earlier times, during the jet formation, the jet is found to be unstable to the m=1 instability, which disrupts the jet and also causes large opening angles, resulting in very poor time-integrated collimation. Thus it is shown that jets which are magnetically confined by an azimuthal field during the acceleration process are probably strongly unstable, at least in our idealized case.

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