Instability of an ionization-shock layer

Details Instability of an ionization-shock layer Instability of an ionization-shock layer

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..535s&link_type=abstract

Astronomy Letters, Volume 24, Issue 4, July 1998, pp.535-542; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 622

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We study the effect of a shock wave on the development of instability of the post-shock subsonic ionization front over a wide range of separations between the fronts, temperatures of the shock-compressed gas layer, and Mach numbers in the ionized zone. A linear analysis reveals a flow instability which is attributable to the multiple reflections of perturbations generated by the ionization front inside the layer. The wavelengths of the most rapidly growing perturbations correspond to the spatial scales of bright rims and `elephant trunks' observed near the boundaries of HII regions. The time it takes for the instability to develop is considerably shorter than the age of typical HII regions. We consider the formation mechanism for the cellular structure of the ionization-shock layer during the decay of the critical supersonic ionization front into a two-front configuration. The appearance of this structure is accompanied by randomization of the gas motion near the ionization (I) fronts.

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