The formation of sharp structures by ambipolar diffusion

Details The formation of sharp structures by ambipolar diffusion The formation of sharp structures by ambipolar diffusion

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..91b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 427, no. 2, p. L91-L94

Astronomy and Astrophysics

Astrophysics

75

Ambipolar Diffusion, Galactic Rotation, Interstellar Magnetic Fields, Magnetic Field Configurations, Magnetic Field Reconnection, Magnetic Flux, Magnetohydrodynamics, Galactic Structure, Ionized Gases, Mathematical Models, Spiral Galaxies

Scientific paper

The effect of ambipolar diffusion is investigated using simple numerical models. Examples are shown where sharp structures develop around magnetic nulls. In contrast to the case of ordinary diffusion, the magnetic field topology is conserved by ambipolar diffusion. This is demonstrated in an example where differential rotation winds up an initially uniform magnetic field and brings oppositely oriented field lines close together. It is argued that ambipolar diffusion produces structures of scales small enough for reconnection to occur.

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