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Magnetically driven jets and windsFour equations for the origin and propagation of nonrelativistic jets and winds are derived from the basic conservation laws of ideal MHD. The axial current density is negative in the vicinity of the axis and positive at larger radii; there is no net current because this is energetically favored. The magnetic field is essential for the jet solutions in that the zz-component of the magnetic stress acts, in opposition to gravity, to drive matter through the slow magnetosonic critical point. For a representative self-consistent disk/jet solution relevant to a protostellar system, the reaction of the accreted mass expelled in the jets is 0.1, the ratio of the power carried by the jets to the disk luminosity is 0.66, and the ratio of the boundary layer to disk luminosities is less than about 0.13. The star's rotation rate decreases with time even for rotation rates much less than the breakup rate.
Document ID
19910069603
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lovelace, R. V. E. (Texas Univ. Austin, TX, United States)
Berk, H. L. (Texas, University Austin, United States)
Contopoulos, J. (Cornell University Ithaca, NY, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 379
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: DE-FG05-80ET-53088
CONTRACT_GRANT: NAGW-2293
Distribution Limits
Public
Copyright
Other