Download Accretion discs, jets and high energy phenomena in by Vassily Beskin, Gilles Henri, Francois Menard, Guy PDF

By Vassily Beskin, Gilles Henri, Francois Menard, Guy Pelletier, Jean Dalibard

ISBN-10: 3540201718

ISBN-13: 9783540201717

The accretion technique is assumed to play a key position within the Universe. This ebook explains, in a kind intelligible to graduate scholars, its relation to the formation of recent stars, to the strength liberate in compact gadgets and to the formation of black holes. The monograph describes how accretion strategies are on the topic of the presence of jets in stellar items and lively galactic nuclei and to jet formation. The authors deal with theoretical paintings in addition to present observational proof. This quantity of the hugely esteemed Les Houches sequence is intended as a complicated textual content that may serve to draw scholars to intriguing new study paintings in astrophysics.

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Additional info for Accretion discs, jets and high energy phenomena in astrophysics: , 29 July-23 August, 2002

Example text

1 Four-vectors and tensors in minkowskian space . . . . . . 2 Equations of special relativistic MHD . . . . . . . . 1 General properties of magneto hydrostatic equilibria . . . . 2 Axisymmetric MHD equilibria and Grad Shafranoff equation . . 1 The perfect MHD limit . . . . . . . . . 3 Field diffusion versus field advection . . . . . 4 A simple model of joint advection and diffusion . . 5 Reconnection flows . . . . . . . . . . . . . 1 Antidynamo theorems .

2) represents the effect of the electro-motive field while the other term represents Ohmic dissipation. 2)? Let L be a characteristic scale of the magnetic field gradients. The ratio of these two terms is approximately |rot(v × B)|/|ηm ∆B| ≈ (vB/L)/(ηm B/L2 ) = vL/ηm . ≡ Rm . 3) The dimensionless number Rm is the magnetic Reynolds number. The large size of astrophysical objects and the good electrical conductibility of gaseous plasmas cause the magnetic Reynolds number of MHD flows in these objects to be usually, though not always, very large.

4 relativistic MHD Non relativistic MHD equations . . Incompressible limit and Navier-Stokes Magnetic pressure and tension . . Alfv´en speed . . . . . . . . . . equation . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Four-vectors and tensors in minkowskian space . . . . . . 2 Equations of special relativistic MHD . . . . . . . . 1 General properties of magneto hydrostatic equilibria . . . . 2 Axisymmetric MHD equilibria and Grad Shafranoff equation .

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