Simulations of Magnetically Driven Astrophysical Jets

Details Simulations of Magnetically Driven Astrophysical Jets Simulations of Magnetically Driven Astrophysical Jets

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5802g&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #58.02; Bulletin of the American Astronomical Society, Vol. 24, p.1215

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Bipolar outflows in protostellar objects may be field-line-twisted magnetohydrodynamic jets. A poloidal magnetic field threading a conducting accretion disk is twisted by the rotation of the disk. The resulting magnetic tension in the axial direction drives material perpendicularly away from the disk, carrying energy, mass, and angular momentum away from the inner regions of the system. Detailed analytical calculations of twisted-field outflows exist already, and we present here realistic magnetohydrodynamic simulations of such jets. We use the semi-implicit code FLX, which was developed for magnetic fusion energy applications, in an (r,z) geometry. The boundary representing the disk is set rotating, and an Alfven pulse propagates along the axial direction. Dissipative boundary regions at the other end allow the outflow to exit the computational box unimpeded. The disk rotation may be Keplerian or solid-body, and the poloidal magnetic field may be either uniform or a distributed dipole. These are the first jet simulations done without specifying an axial velocity as a boundary condition. The axial velocity is determined by the rotation of the disk and the strength of the magnetic field, and the values achieved are in agreement with velocities observed in outflows from protostellar objects. Over much of the simulation domain the component of the current parallel to the magnetic field dominates over the perpendicular current, indicating that the system is evolving toward a helical force-free configuration. Even in the distributed dipole diverging field, the outflow remains fairly well collimated out to hundreds of stellar radii.

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