The Solar Tachocline
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The Solar Tachocline
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Author : D. W. Hughes
language : en
Publisher: Cambridge University Press
Release Date : 2007-05-31
The Solar Tachocline written by D. W. Hughes and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-31 with Science categories.
Helioseismology has enabled us to probe the internal structure and dynamics of the Sun, including how its rotation varies in the solar interior. The unexpected discovery of an abrupt transition - the tachocline - between the differentially rotating convection zone and the uniformly rotating radiative interior has generated considerable interest and raised many fundamental issues. This volume contains invited reviews from distinguished speakers at the first meeting devoted to the tachocline, held at the Isaac Newton Institute. It provides a comprehensive account of the understanding of the properties and dynamics of the tachocline, including both observational results and major theoretical issues, involving both hydrodynamic and magnetohydrodynamic behaviour. The Solar Tachocline is a valuable reference for researchers and graduate students in astrophysics, heliospheric physics and geophysics, and the dynamics of fluids and plasmas.
The Solar Tachocline
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Author :
language : en
Publisher:
Release Date : 2007
The Solar Tachocline written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Helioseismology categories.
Reference on the tachocline for researchers and graduates in astrophysics, heliospheric physics, and fluid and plasma dynamics.
Dynamics Of The Solar Tachocline
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Author : Pascale Garaud
language : en
Publisher:
Release Date : 2001
Dynamics Of The Solar Tachocline written by Pascale Garaud and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The Solar Tachocline
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Author : Toby Wood
language : en
Publisher:
Release Date : 2011
The Solar Tachocline written by Toby Wood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
In this dissertation we consider the dynamics of the solar interior, with particular focus on angular momentum balance and magnetic field confinement within the tachocline. In Part I we review current knowledge of the Sun's rotation. We summarise the main mechanisms by which angular momentum is transported within the Sun, and discuss the difficulties in reconciling the observed uniform rotation of the radiative interior with purely hydrodynamical theories. Following Gough & McIntyre (1998) we conclude that a global-scale interior magnetic field provides the most plausible explanation for the observed uniform rotation, provided that it is confined within the tachocline. We discuss potential mechanisms for magnetic field confinement, assuming that the field has a roughly axial-dipolar structure. In particular, we argue that the field is confined, in high latitudes, by a laminar downwelling flow driven by turbulence in the tachocline and convection zone above. In Part II we describe how the magnetic confinement picture is affected by the presence of compositional stratification in the 'helium settling layer' below the convection zone. We use scaling arguments to estimate the rate at which the settling layer forms, and verify our predictions with a simple numerical model. We discuss the implications for lithium depletion in the convection zone. In Part III we present numerical results showing how the Sun's interior magnetic field can be confined, in the polar regions, while maintaining uniform rotation within the radiative envelope. These results come from solving the full, nonlinear equations numerically. We also show how these results can be understood in terms of a reduced, analytical model that is asymptotically valid in the parameter regime of relevance to the solar tachocline. In Part IV we discuss how our high-latitude model can be extended to a global model of magnetic confinement within the tachocline.
Instabilities In The Solar Tachocline
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Author : Fayyaz Qamar Rashid
language : en
Publisher:
Release Date : 2010
Instabilities In The Solar Tachocline written by Fayyaz Qamar Rashid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Formation And Stability Of The Solar Tachocline In Mhd Simulations
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Author : Aniket Sule
language : en
Publisher:
Release Date : 2007
Formation And Stability Of The Solar Tachocline In Mhd Simulations written by Aniket Sule and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Magnetic Buoyancy Instability In The Solar Tachocline
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Author : Daniela Frances Motycka Weston
language : en
Publisher:
Release Date : 2020
Magnetic Buoyancy Instability In The Solar Tachocline written by Daniela Frances Motycka Weston and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Chaotic Dynamics Of The Solar Cycle
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Author :
language : en
Publisher:
Release Date : 1996
Chaotic Dynamics Of The Solar Cycle written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
The cyclic variation of solar activity is both irregular and intermittent. We have sought to isolate and illuminate the physical mechanisms of this behavior and to provide a mathematical description of it. Our work has brought out three ingredients of the solar cycle that we believe to be central to its operation. (1) The seat of the solar cycle is in a shear layer just below the solar convection zone. We have investigated the structure of this layer (which we call the solar tachocline) in some detail. (2) The spatio-temporal development of the solar cycle is represented by the propagation of robust solitary waves which are affected by dissipation and instability. We have studied the structure and interactions of such waves, which we call solitoids. (3) On top of the simple propagative behavior of the solar solitoids there are intermissions during which the number of sunspots remains quite small. We attribute these intermissions (such as the Maunder minimum) to a form of interaction between the convection zone and the tachocline which is characteristic of a process that we have developed and that we call on/off intermittency. These three ingredients make up some of the key features of the solar cycle and may be expected to play a role in future simulations of the solar cycle.
Lithium As A Passive Tracer Probing The Rotating Solar Tachocline Turbulence
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Author : Günther Rüdiger
language : en
Publisher:
Release Date : 2000
Lithium As A Passive Tracer Probing The Rotating Solar Tachocline Turbulence written by Günther Rüdiger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Iutam Symposium On Turbulence In The Atmosphere And Oceans
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Author : David Dritschel
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-12-09
Iutam Symposium On Turbulence In The Atmosphere And Oceans written by David Dritschel 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 2010-12-09 with Science categories.
The text of the Persian poet Rum ̄ ̄ ?, written some eight centuries ago, and reproduced at the beginning of this book is still relevant to many of our pursuits of knowledge, not least of turbulence. The text illustrates the inability people have in seeing the whole thing, the ‘big picture’. Everybody looks into the problem from his/her vi- point, and that leads to disagreement and controversy. If we could see the whole thing, our understanding would become complete and there would be no cont- versy. The turbulent motion of the atmosphere and oceans, at the heart of the observed general circulation, is undoubtedly very complex and dif?cult to understand in its entirety. Even ‘bare’ turbulence, without rotation and strati?cation whose effects are paramount in the atmosphere and oceans, still poses great fundamental ch- lenges for understanding after a century of research. Rotating strati?ed turbulence is a relatively new research topic. It is also far richer, exhibiting a host of distinct wave types interacting in a complicated and often subtle way with long-lived - herent structures such as jets or currents and vortices. All of this is tied together by basic ?uid-dynamical nonlinearity, and this gives rise to a multitude of phen- ena: spontaneous wave emission, wave-induced transport, both direct and inverse energy scale cascades, lateral and vertical anisotropy, fronts and transport barriers, anomalous transport in coherent vortices, and a very wide range of dynamical and thermodynamical instabilities.