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Record 11 of 34
Solar Nebula Magnetohydrodynamic Dynamos: Kinematic Theory, Dynamical Constraints, and Magnetic Transport of Angular Momentum
Offline Availability: Go to Request Form
External Online Source: doi:10.1006/icar.1993.1159
Author and Affiliation:
Stepinski, Tomasz F.(Lunar and Planetary Inst., Houston, TX United States)
Reyes-Ruiz, Mauricio(Rice Univ., Dept. of Space Physics and Astronomy, Houston, TX United States)
Vanhala, Harri A. T.(Oulu Univ., Dept. of Astronomy, Finland)
Abstract: A hydromagnetic dynamo provides the best mechanism for contemporaneously producing magnetic fields in a turbulent solar nebula. We investigate the solar nebula in the framework of a steady-state accretion disk model and establish the criteria for a viable nebular dynamo. We have found that typically a magnetic gap exists in the nebula, the region where the degree of ionization is too small for the magnetic field to couple to the gas. The location and width of this gap depend on the particular model; the supposition is that gaps cover different parts of the nebula at different evolutionary stages. We have found, from several dynamical constraints, that the generated magnetic field is likely to saturate at a strength equal to equipartition with the kinetic energy of turbulence. Maxwell stress arising from a large-scale magnetic field may significantly influence nebular structure, and Maxwell stress due to small-scale fields can actually dominate other stresses in the inner parts of the nebula. We also argue that the bulk of nebular gas, within the scale height from the midplane, is stable against Balbus-Hawley instability.
Publication Date: May 12, 1993
Document ID:
19970022027
(Acquired Jul 30, 1997)
Accession Number: 97N72075
Subject Category: SOLAR PHYSICS
Report/Patent Number: NASA-CR-204467, NAS 1.26:204467, LPI-Contrib-811
Document Type: Reprint
Publication Information: ICARUS (ISSN 0019-1035); Volume 106; 77-91
Publisher Information: Academic Press, Inc., United States
Meeting Information: Planet Formation; 1992; Santa Barbara, CA; United States
Contract/Grant/Task Num: NASw-4574
Financial Sponsor: NASA; Washington, DC United States
Organization Source: Lunar and Planetary Inst.; Houston, TX United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: MAGNETOHYDRODYNAMICS; NEBULAE; KINETIC ENERGY; ANGULAR MOMENTUM; SOLAR CORONA; ACCRETION DISKS; MAGNETIC FIELDS; MOMENTUM TRANSFER; PLANETARY NEBULAE; SCALE HEIGHT; STEADY STATE; TURBULENCE; ROTATING GENERATORS; IONIZATION; EQUIPARTITION THEOREM
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