Back to the Abstract

	1 Introduction
	2 Linearized equations of the shocked Bondi flow
	3 Spectrum of eigenfrequencies
	4 The sound of vorticity
	5 Vortical-acoustic instability at high frequency
	6 Vortical-acoustic instability at low frequency
	7 Effects of post-shock acceleration: A global instability with a local criterion
	8 Discussion
	9 Conclusions
	Appendix A: Vorticity perturbations produced by the perturbed shock
	Appendix B: Approximations of the acoustic perturbation
	Appendix C: Formulation of the boundary value problem
	Appendix D: Calculation of
	Appendix E: Decomposition of the perturbation onto vorticity waves and acoustic waves in the WKB approximation
	Appendix F: WKB approximation of the dispersion relation
	Appendix G: Analysis of the phase relation of the two cycles
	Appendix H: Pseudosound approximation of the dispersion relation
	References