Statistics – Computation
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4308g&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #43.08; Bulletin of the American Astronomical Society, Vol. 24, p.798
Statistics
Computation
Scientific paper
Bipolar outflows observed in protostellar objects may be field-line-twisted magnetohydrodynamic jets. A poloidal magnetic field threading a conducting accretion disk is twisted by the differential rotation in the disk. This twisting produces a magnetic tension in the axial direction that 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, but for the first time we have performed 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, and the simulation approaches a quasi-steady state.
Barnes Daniel
Gerwin Richard
Gisler Galen
Lovelace Richard
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