The dynamics of internal working surfaces in MHD jets

Details The dynamics of internal working surfaces in MHD jets The dynamics of internal working surfaces in MHD jets

2008-08-18

arxiv.org/abs/0808.2346v1

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures. ApJ in press

Scientific paper

10.1086/592489

The dynamical effects of magnetic fields in models of radiative, Herbig-Haro (HH) jets have been studied in a number of papers. For example, magnetized, radiative jets from variable sources have been studied with axisymmetric and 3D numerical simulations. In this paper, we present an analytic model describing the effect of a toroidal magnetic field on the internal working surfaces that result from a variability in the ejection velocity. We find that for parameters appropriate for HH jets the forces associated with the magnetic field dominate over the gas pressure force within the working surfaces. Depending on the ram pressure radial cross section of the jet, the magnetic field can produce a strong axial pinch, or, alternatively, a broadening of the internal working surfaces. We check the validity of the analytic model with axisymmetric numerical simulations of variable, magnetized jets.

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