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Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 2. Cylindrical boundary layer in vortex sheet approximation

Journal Article:

Abstract

This second paper of the series is devoted to Kelvin-Helmholtz instabilities in cylindrical boundary layer flows (jets). The vortex-sheet approximation is still used, and compressible flows are studied in subsonic, transonic, supersonic and relativistic regimes. Magnetic field effects are analysed, together with density contrast inside and outside the jet. The general result is that, due to the onset of a so-called reflection branch of resonant modes, jets are always unstable, both to pinching and helical perturbations with wavelengths of the order of the jet circumference. In particular the time-scales for instability are such that this certainly plays a significant part in the morphology and energetics of extended radio sources.
Authors:
Ferrari, A; [1]  Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica); Trussoni, E; Zaninetti, L [2] 
  1. Max-Planck-Institut fuer Extraterrestrische Physik, Garching b. Muenchen (Germany, F.R.)
  2. Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica
Publication Date:
Sep 01, 1981
Product Type:
Journal Article
Reference Number:
AIX-12-633910; EDB-82-023703
Resource Relation:
Journal Name: Mon. Not. R. Astron. Soc.; (United Kingdom); Journal Volume: 196:3
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC RADIO SOURCES; JETS; HELMHOLTZ INSTABILITY; BOUNDARY LAYERS; CYLINDRICAL CONFIGURATION; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; VORTEX FLOW; CONFIGURATION; FLUID FLOW; FLUID MECHANICS; HYDRODYNAMICS; INSTABILITY; LAYERS; MECHANICS; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; 640103* - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987)
OSTI ID:
5973934
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MNRAA
Submitting Site:
INIS
Size:
Pages: 1051-1066
Announcement Date:

Journal Article:

Citation Formats

Ferrari, A, Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica), Trussoni, E, and Zaninetti, L. Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 2. Cylindrical boundary layer in vortex sheet approximation. United Kingdom: N. p., 1981. Web.
Ferrari, A, Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica), Trussoni, E, & Zaninetti, L. Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 2. Cylindrical boundary layer in vortex sheet approximation. United Kingdom.
Ferrari, A, Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica), Trussoni, E, and Zaninetti, L. 1981. "Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 2. Cylindrical boundary layer in vortex sheet approximation." United Kingdom.
@misc{etde_5973934,
title = {Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 2. Cylindrical boundary layer in vortex sheet approximation}
author = {Ferrari, A, Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica), Trussoni, E, and Zaninetti, L}
abstractNote = {This second paper of the series is devoted to Kelvin-Helmholtz instabilities in cylindrical boundary layer flows (jets). The vortex-sheet approximation is still used, and compressible flows are studied in subsonic, transonic, supersonic and relativistic regimes. Magnetic field effects are analysed, together with density contrast inside and outside the jet. The general result is that, due to the onset of a so-called reflection branch of resonant modes, jets are always unstable, both to pinching and helical perturbations with wavelengths of the order of the jet circumference. In particular the time-scales for instability are such that this certainly plays a significant part in the morphology and energetics of extended radio sources.}
journal = {Mon. Not. R. Astron. Soc.; (United Kingdom)}
volume = {196:3}
journal type = {AC}
place = {United Kingdom}
year = {1981}
month = {Sep}
}