MHD Stability of Phase Transition Layers in the Neutral ISM

Details MHD Stability of Phase Transition Layers in the Neutral ISM MHD Stability of Phase Transition Layers in the Neutral ISM

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0506s&link_type=abstract

American Astronomical Society, AAS Meeting #212, #5.06; Bulletin of the American Astronomical Society, Vol. 40, p.195

Astronomy and Astrophysics

Astronomy

Scientific paper

The thermal-type corrugational instability is important in accelerating burning in combustion fronts in Type Ia supernova explosions (Dursi 2004). Recent work has shown that evaporation fronts, analogous to combustion fronts, in an unmagnetized, neutral ISM are also unstable to wrinkling, whereas condensation fronts are stable (Inoue et al. 2006). Whether a front is of the evaporation or condensation type depends on the external pressure.
We extend this work by considering the scenario of a magnetic field perpendicular to a front separating the Cold Neutral Medium and Warm Neutral Medium in a plane-parallel geometry. A linear stability analysis is performed to assess the behavior of both front types when subject to incompressible, corrugational perturbations with wavelengths larger than the thickness of the front.
We demonstrate the existence of a mode that is unstable in condensation fronts but stable in evaporation fronts, in contrast to the hydrodynamic case. Estimates of the growth rate and magnetic field strength threshold of this mode are provided and implications for generation of small-scale neutral ISM structure are discussed.
We acknowledge support from NASA ATP grant NNG051G09G.

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