Formation of Force-Free Helix as a Model for Astrophysical Jets

Details Formation of Force-Free Helix as a Model for Astrophysical Jets Formation of Force-Free Helix as a Model for Astrophysical Jets

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..aprv16012l&link_type=abstract

American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #V16.012

Astronomy and Astrophysics

Astrophysics

Scientific paper

We model the formation of force-free astrophysical jets by numerically solving the Grad-Shafranov equation with axisymmetry. An initial flux distribution is set up on a Keplerian disk, which is regarded as perfectly conducting and massive. We use the differential rotation of the disk as the input control parameter and calculate the current on each flux surface self-consistently. Since the greatest winding of the flux surfaces takes place at small radius, we show that most of the magnetic energy is concentrated near the disk axis, resulting in the formation and strong collimation of force-free magnetic helix. Furthermore, we show that the increasing differential winding gives an axially growing magnetic tower.

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