Physics – Plasma Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..337t&link_type=abstract
In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 337-340 (SEE N94-22624 05-75)
Physics
Plasma Physics
1
Astronomical Models, Herbig-Haro Objects, Interstellar Magnetic Fields, Magnetohydrodynamic Stability, Magnetohydrodynamics, Plasma Jets, Protostars, Stellar Mass Ejection, Computerized Simulation, Helical Flow, Magnetic Field Configurations, Stellar Winds, Three Dimensional Models
Scientific paper
The results of three dimensional magnetohydrodynamic numerical simulations are described. They are applied to the behavior of the jets from young stellar objects under circumstances in which the ambient large scale interstellar magnetic field is twisted helically by the rotation of protostar and the protostellar disk through which this field threads. The calculations are continued until the bow shock propagates a distance 60 times as far as the initial jet radius. The case examined involves a jet with density 100 mH/cubic cm and velocity 100 km/s. It is shown that an azimuthal field Bphi of strength 70 mu G drives a helical kink instability. The growth rate of this instability is large enough that significant morphological effects are expected to be visible during the typical lifetime of a Herbig-Haro (HH) object.
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