Star Formation and the Hall Effect

@article{Wardle2004StarFA,
  title={Star Formation and the Hall Effect},
  author={Mark Wardle},
  journal={Astrophysics and Space Science},
  year={2004},
  volume={292},
  pages={317-323}
}
  • M. Wardle
  • Published 4 July 2003
  • Physics
  • Astrophysics and Space Science
The breakdown of flux-freezing in molecular clouds and protostellar discs is usually approximated by ambipolar diffusion at low densities or by resistive diffusion at high densities. Here an intermediate regime is discussed in which the Hall term in the conductivity tensor is significant, and the vector evolution of the magnetic field, and therefore the evolution of the system under consideration is dramatically altered. Calculations of charged particle abundances in dense gas in molecular… 
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References

SHOWING 1-8 OF 8 REFERENCES
A Powerful Local Shear Instability in Weakly Magnetized Disks. II. Nonlinear Evolution
We consider the dynamical evolution of an accretion disk undergoing Keplerian shear flow in the presence of a weak magnetic field. A linear perturbation analysis presented in a companion paper shows
Magnetic flux loss from interstellar clouds with various grain-size distributions
The densities of charged particles and the dissipation of magnetic fields in interstellar clouds shielded from UV radiation and having densities between 1000 and 10 to the 13th/cu cm are
The Balbus-Hawley instability in weakly ionized discs
ABSTRA C T MHD in protostellar discs is modified by the Hall current when the ambipolar diffusion approximation breaks down. Here I examine the Balbus‐Hawley (magnetorotational) instability of a
Linear analysis of the Hall effect in protostellar disks
The effects of Hall electromotive forces (HEMFs) on the linear stability of protostellar disks are examined. Earlier work on this topic focused on axial field and perturbation wavenumber geometry.
The conductivity of dense molecular gas
We evaluate the conductivity tensor for molecular gas at densities ranging from 104 to 1015 cm-3 for a variety of grain models. The Hall contribution to the conductivity has generally been neglected
X-Ray Ionization of the Disks of Young Stellar Objects
We have developed a Monte Carlo code for the transport of stellar X-rays in an axially symmetric disk. The code treats Compton scattering and photoelectric absorption and follows the X-rays until
Magnetic flux loss from interstellar clouds
Une etude des densites de differentes particules chargees dans l'equilibre ionisation-recombinaison et de la dissipation du champ magnetique dans les nuages interstellaires est realisee avec de