Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.6501z&link_type=abstract
American Astronomical Society Meeting 210, #65.01; Bulletin of the American Astronomical Society, Vol. 39, p.173
Other
Scientific paper
The magnetic diffusivity of the interstellar medium is critical to the evolution of interstellar clouds, to star formation, and to galactic dynamo processes. There are two types of magnetic diffusion: resistive diffusion, which changes the magnetic topology, and ambipolar diffusion, which operates in weakly ionized gas and preserves magnetic topology but allows the field to slip relative to the neutrals. The ambipolar diffusivity is generally the larger of the two, but the kinetic theory values of both diffusivities are small enough that the magnetic field should be frozen to the gas on large scales. I will show that ambipolar diffusion, like other forms of diffusion, is greatly accelerated by turbulence, and will discuss the consequences for the fieldstrength-density relation in the interstellar medium and for the evolution of molecular clouds.
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