Statistics – Computation
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..809e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 15, 1988, p. 809-820.
Statistics
Computation
8
Computational Astrophysics, Gravitational Collapse, Magnetic Clouds, Magnetic Stars, Protostars, Star Formation, Ambipolar Diffusion, Field Strength, Gravitational Effects, Interstellar Matter, Molecular Clouds
Scientific paper
The redistribution of magnetic flux in a collapsing protostellar magnetic cloud subject to Ohmic dissipation is discussed. The evolution of five axisymmetric, nonrotating, and initially uniform cloud models has been numerically calculated. The results indicate that the Ohmic dissipation becomes significant at densities of greater than about 50/cu cm. At densities of about 10 to the 13th/cu cm, the central magnetic flux was found to decrease by more than three orders of magnitude. Although the present computations give only values of the central magnetic flux dissipation, the same behavior can be expected for other zones when reaching densities of greater than about 5 x 10 to the 10th/cu cm. Therefore it can be suggested that the magnetic field is dissipated by Joule heating at high density if it has not been dissipated by ambipolar diffusion at low density. Due to magnetic dissipation, the magnetic field tends to increase isotropically.
Aiad A.
El-Nawawy M. S.
El-Shalaby M. A.
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