Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..622n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 622-627. Research supported by U.S. Army, San
Astronomy and Astrophysics
Astronomy
27
Interstellar Matter, Plasma Dynamics, Protostars, Star Formation, Stellar Models, Angular Momentum, Interstellar Magnetic Fields, Radio Jets (Astronomy), Stellar Winds, T Tauri Stars
Scientific paper
A model is developed for the time-dependent twisting of an initial poloidal magnetic field threading a conducting protostellar disk. The region outside the disk is assumed to be filled, at least initially, with a low-density, force-free 'coronal' plasma. The differential rotation of the disk acts to twist the B field in the space outside the disk thus generating a toroidal magnetic field. In turn, the toroidal field acts to pinch the plasma and the poloidal field toward the system axis producing a collimated channel. This channel could facilitate the formation of bipolar flows. The magnitude and duration of the field twisting is expected to be limited by magnetohydrodynamic instability.
Lovelace Richard V. E.
Newman Alice L.
Newman William I.
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