## The Physics of Astrophysics: Gas dynamicsThis two-volume text is for new graduates on astronomy courses who need to get to grips with the physics involved in the subject. Four problem sets, averaging three problems per set, accompany each volume. The problems expand on the material covered in the texts and represent the level of calculational skill needed to write scientific papers in contemporary astrophysics. |

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### Contents

OVERVIEW | 3 |

RELATION OF KINETIC THEORY TO FLUID MECHANICS | 14 |

TRANSPORT COEFFICIENTS FOR DIFFUSIVE EFFECTS | 25 |

FLUIDS AS CONTINUA | 37 |

EQUILIBRIA OF SELFGRAVITATING SPHERICAL MASSES | 54 |

INVISCID BAROTROPIC FLOW | 64 |

VISCOUS ACCRETION DISKS | 82 |

FLUID INSTABILITIES | 93 |

GRAVITATIONAL COLLAPSE AND STAR FORMATION | 241 |

RADIATIVE SHOCKS UNDER OPTICALLY THICK | 252 |

IONIZATION FRONTS AND EXPANDING Hn REGIONS | 264 |

MAGNETOHYDRODYNAMICS | 289 |

HYDROMAGNETIC EQUATIONS AND HYDROMAGNETIC | 302 |

MAGNETOSTATICS AND THE PARKER INSTABILITY | 317 |

THE MAGNETIC VIRIAL THEOREM | 328 |

HYDROMAGNETIC SHOCK WAVES | 338 |

VISCOUS SHEAR FLOWS AND TURBULENCE | 113 |

MIXINGLENGTH THEORY OF CONVECTION | 125 |

DISPERSION RELATION | 135 |

GROUP PROPAGATION | 152 |

METHOD OF CHARACTERISTICS | 166 |

STEADY SUPERSONIC FLOW | 185 |

STEEPENING OF ACOUSTIC WAVES INTO SHOCK WAVES | 203 |

OBLIQUE SHOCKS AND OPTICALLY THIN RADIATIVE | 218 |

BLAST WAVES AND SUPERNOVA REMNANTS | 230 |

MAGNETIC RECONNECTION AND DYNAMOS | 346 |

AMBIPOLAR DIFFUSION | 360 |

PLASMA PHYSICS | 372 |

LONGITUDINAL PLASMA OSCILLATIONS AND LANDAU | 390 |

ORBIT THEORY AND DRIFT CURRENTS | 403 |

A USEFUL FORMULAE IN CURVILINEAR COORDINATES | 423 |

459 | |

### Common terms and phrases

accretion accretion disks adiabatic adiabatic invariant Alfven Alfven wave angular momentum approximation astrophysical Bernoulli's theorem blob boundary conditions bow shock Chapter cloud coefficient collisions compression constant convective corotation derivative differential diffusion disk drift dynamics effects electric electrons energy equals equilibrium field lines Figure fluid element flux force function given by equation gradient gravitational field gyroradius heat Hn region instability integral interstellar interstellar medium ionization front ions isothermal jump conditions kinetic magnetic field magnetic reconnection mass mean free path mechanics medium minus characteristic molecular cloud motion neutral nonlinear obtain occurs optically particles photons physical plasma pressure Problem Set propagation protostar radiation radiative radius right-hand side rotation scale self-gravitating shock front shock wave side of equation solution spatial speed spiral density waves stability star stellar subsonic supersonic flow surface temperature tensor theorem thermal tion turbulence vector velocity viscous volume yields zero