On Magnetic Fields In Hi Clouds
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On Magnetic Fields In Hi Clouds
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Author : Stanisław Grzędzielski
language : en
Publisher:
Release Date : 1962
On Magnetic Fields In Hi Clouds written by Stanisław Grzędzielski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with categories.
The Generation Of High Magnetic Fields
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Author : David H. Parkinson
language : en
Publisher: Springer
Release Date : 2013-11-21
The Generation Of High Magnetic Fields written by David H. Parkinson and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-21 with Science categories.
Magnetohydrodynamics Of Wind Cloud Interactions
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Author : Wladimir Eduardo Banda-Barragan
language : en
Publisher:
Release Date : 2016
Magnetohydrodynamics Of Wind Cloud Interactions written by Wladimir Eduardo Banda-Barragan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Filaments are ubiquitous in the interstellar medium, yet their formation, internal structure, magnetic properties, and longevity have not been analysed in detail. In this thesis I report the results from a comprehensive numerical study that investigates the characteristics, formation, dynamics, and global evolution of filamentary structures arising from (magneto)hydrodynamic interactions between supersonic winds and interstellar clouds. Here I improve on previous wind-cloud simulations by utilising higher numerical resolutions, sharper density contrasts, more complex magnetic field configurations, and more realistic systems with turbulent clouds. I use gas multi-tracking algorithms and state-of-the-art visualisation techniques to study the physical mechanisms acting upon wind-swept clouds. I find that material originally in the envelopes of the clouds is removed and transported downstream to form filamentary tails, while the cores of the clouds serve as footpoints and late-stage outer layers of these low-density tails. The evolution of filaments comprises four phases: 1) tail formation, 2) tail erosion, 3) footpoint dispersion, and 4) filament free floating. Overall, wind-cloud interactions produce filaments with aspect ratios >10, lateral expansions 1-3 of the core radius, mixing fractions 10-30%, velocity dispersions 0.02-0.05 of the wind speed, and magnetic field amplifications by factors of 10-100. I find that the strength of magnetic fields regulates vorticity production: sinuous filamentary towers arise in non-magnetic environments, while strong magnetic fields inhibit small-scale Kelvin-Helmholtz perturbations at boundary layers making tails less turbulent. The orientation of magnetic fields also influences the morphology of filaments: magnetic field components aligned with the direction of the wind favour the formation of pressure-confined flux ropes inside the tails, whilst transverse components tend to form current sheets and favour the growth of Rayleigh-Taylor perturbations at the leading edge of the clouds. I also investigate how turbulence influences the formation of filaments by sequentially adding log-normal density profiles, Gaussian velocity fields, and turbulent magnetic fields into the initial clouds. The porosity of turbulent density profiles aids the propagation of internal shocks through filament material, accelerating mixing and increasing the internal velocity dispersion. The inclusion of subsonically-turbulent velocity fields has little effect on the evolution, while supersonically-turbulent velocity fields accelerate the cloud expansion and subsequent break-up. Line stretching and compression amplify the magnetic energy of turbulent filaments creating highly-magnetised knots and sub-filaments along their tails. In all models the magnetic energy enhancement saturates when the ratio of turbulent kinetic to turbulent magnetic energy densities is 5-10. At the end of this thesis I discuss the relevance of this work for the study of clouds and filaments in the Galactic centre and provide my perspectives on potential future research in this field. Using ray-tracing techniques I create synthetic emission maps of wind-swept clouds and compare them with radio observations of high-latitude H I clouds and non-thermal filaments in this region of the Galaxy. I interpret these structures as remains of the interplay between outflows driven by localised star formation and dense clouds in the surrounding medium. The simulated morphology, lifespan, magnetic properties, and kinematics are consistent with those inferred from observations of these clouds and non-thermal filaments.
Cosmic Magnetic Fields
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Author : Richard Wielebinski
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-09-13
Cosmic Magnetic Fields written by Richard Wielebinski and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-09-13 with Science categories.
While magnetic fields permeate the universe on all scales, the present book is dedicated to their investigation on the largest scales and affords a balanced account of both theoretical and observational aspects. Written as a set of advanced lectures and tutorial reviews that lead up to the forefront of research, this book offers both a modern source of reference for the experienced researchers as well as a high-level introductory text for postgraduate students and nonspecialist researchers working in related areas.
The Role Of Magnetic Fields In The Formation Of Stars
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Author : Derek Ward-Thompson
language : en
Publisher: Frontiers Media SA
Release Date : 2020-06-29
The Role Of Magnetic Fields In The Formation Of Stars written by Derek Ward-Thompson and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-29 with categories.
Interstellar Magnetic Fields
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Author : Rainer Beck
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Interstellar Magnetic Fields written by Rainer Beck and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Proceedings of a Workshop, Held at Schloß Ringberg, September 8-12, 1986
Path Of Mesons In High Pressure Cloud Chamber With Intense Magnetic Field
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Author : R. W. Safford
language : en
Publisher:
Release Date : 1950
Path Of Mesons In High Pressure Cloud Chamber With Intense Magnetic Field written by R. W. Safford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1950 with Cloud chamber categories.
Galactic And Intergalactic Magnetic Fields
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Author : R. Beck
language : en
Publisher: Springer Science & Business Media
Release Date : 1990-04-30
Galactic And Intergalactic Magnetic Fields written by R. Beck and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-04-30 with Science categories.
This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.
On The Magnetic Field In Interstellar Molecular Clouds
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Author : P. L. Baker
language : en
Publisher:
Release Date : 1978
On The Magnetic Field In Interstellar Molecular Clouds written by P. L. Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Galactic And Intergalactic Magnetic Fields
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Author : R. Beck
language : en
Publisher: Springer
Release Date : 1990-05-14
Galactic And Intergalactic Magnetic Fields written by R. Beck and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-05-14 with Science categories.
This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.