Astrophysical Plasma (Lecture - 07) by Professor G Srinivasan скачать в хорошем качестве

Astrophysical Plasma (Lecture - 07) by Professor G Srinivasan

Summer course 2018 - A Random walk in astro-physics Lecture - 07 : Astrophysical Plasma by Professor G Srinivasan, Raman Research Institute (Retired) 10.00 to 12.00 Friday, 18 May 2018 Madhava Lecture Hall, ICTS Bangalore The range of densities, temperatures, magnetic fields, etc. that obtain in the Universe are staggering: from 10-27 g cm-3 to 1015 g cm-3, from 3K to 1010 K, from 10-6 G to 1015 G. Not surprisingly, the variety of physical phenomena one encounters during the study of celestial objects is truly impressive. This set of lectures is intended to illustrate the richness of Astrophysics. It will be a random walk in basic physics, with numerous illustrations from astronomy. The topics in physics that will be reviewed have been chosen on the basis of their importance in contemporary astronomy. Topics: Absorption and emission of radiation Radiation from relativistic electrons Compton scattering of radiation Spontaneous and stimulated emission Hyperfine splitting of energy levels Molecular spectra Astrophysical plasma. Quantum tunnelling. Nuclear matter Neutrino Oscillation Phase transitions and the early Universe During this random walk in physics, one will encounter a range of astronomical objects and phenomena, such as, Solar wind, gaseous nebulae, interstellar hydrogen clouds, giant molecular clouds, neutron stars and pulsars, supernova remnants, radio galaxies and quasars, active galactic nuclei, the cosmic microwave background, etc. https://www.icts.res.in/summercourse2018 Table of Contents (powered by https://videoken.com) 0:00:00 Summer course 2018 - A Random walk in astro-physics 0:00:10 Astrophysical Plasma (Lecture - 07) 0:01:12 A Plasma is a quasi-neutral gas of charged and neutral particles which exhibits "collective behaviour" 0:01:40 Plasma 0:03:57 Dielectric Screening 0:24:37 An energy-loss spectrum for a thin AI film 0:35:54 Dispersion relation of waves in a plasma 0:39:04 Earth's IONOSPHERE 0:44:02 Group velocity, Phase velocity, Refractive index 0:47:25 The group velocity 0:49:14 Dispersion of Pulsar signals 0:59:34 Pulsar De-dispersion 1:02:59 Faraday Rotation 1:08:11 Dielectric constant 1:24:12 M4: The Milky Way Magnetic Field Mapping Mission 1:25:02 Cerenkov Radiation 1:25:03 NGC 5775 1:30:16 Nobel Prize in Physics 1958 1:30:44 From Tamm's Nobel Lecture: 1:35:28 Cherenkov Radiation 1:36:30 Cerenkov light emitted by electrons in a "swimming pool nuclear reactor" 1:37:27 The wave vector and frequency of an electromagnetic wave in a transparent medium are related by 1:41:45 Let theta be the angle between the direction of motion and the direction of emission. 1:44:42 Shock wave in a gas 1:52:30 Ooty 1:54:58 Detection of Cerenkov light emitted by electrons underlies most of the modern neutrino detectors. 1:56:42 Plasma effect on Synchrotron Intensity 1:56:53 Relativistic Beaming 1:56:58 Next Lecture: The Origin of Stellar Energy 1:57:10 Q&A