Investigating The Evolution Of The Large Scale Cyclic Solar Magnetic Fields By Babcock Leighton Flux Transport Dynamo Model
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Investigating The Evolution Of The Large Scale Cyclic Solar Magnetic Fields By Babcock Leighton Flux Transport Dynamo Model
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Author : Belucz Bernadett
language : en
Publisher:
Release Date : 2016
Investigating The Evolution Of The Large Scale Cyclic Solar Magnetic Fields By Babcock Leighton Flux Transport Dynamo Model written by Belucz Bernadett 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.
The Origin And Dynamics Of Solar Magnetism
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Author : M.J. Thompson
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-05-01
The Origin And Dynamics Of Solar Magnetism written by M.J. Thompson 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 2009-05-01 with Science categories.
Starting in 1995 numerical modeling of the Earth’s dynamo has ourished with remarkable success. Direct numerical simulation of convection-driven MHD- ow in a rotating spherical shell show magnetic elds that resemble the geomagnetic eld in many respects: they are dominated by the axial dipole of approximately the right strength, they show spatial power spectra similar to that of Earth, and the magnetic eld morphology and the temporal var- tion of the eld resembles that of the geomagnetic eld (Christensen and Wicht 2007). Some models show stochastic dipole reversals whose details agree with what has been inferred from paleomagnetic data (Glatzmaier and Roberts 1995; Kutzner and Christensen 2002; Wicht 2005). While these models represent direct numerical simulations of the fundamental MHD equations without parameterized induction effects, they do not match actual pla- tary conditions in a number of respects. Speci cally, they rotate too slowly, are much less turbulent, and use a viscosity and thermal diffusivity that is far too large in comparison to magnetic diffusivity. Because of these discrepancies, the success of geodynamo models may seem surprising. In order to better understand the extent to which the models are applicable to planetary dynamos, scaling laws that relate basic properties of the dynamo to the fundamental control parameters play an important role. In recent years rst attempts have been made to derive such scaling laws from a set of numerical simulations that span the accessible parameter space (Christensen and Tilgner 2004; Christensen and Aubert 2006).
The Solar Activity Cycle
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Author : André Balogh
language : en
Publisher: Springer
Release Date : 2015-04-16
The Solar Activity Cycle written by André Balogh and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-16 with Science categories.
A collection of papers edited by four experts in the field, this book sets out to describe the way solar activity is manifested in observations of the solar interior, the photosphere, the chromosphere, the corona and the heliosphere. The 11-year solar activity cycle, more generally known as the sunspot cycle, is a fundamental property of the Sun. This phenomenon is the generation and evolution of magnetic fields in the Sun’s convection zone, the photosphere. It is only by the careful enumeration and description of the phenomena and their variations that one can clarify their interdependences. The sunspot cycle has been tracked back about four centuries, and it has been recognized that to make this data set a really useful tool in understanding how the activity cycle works and how it can be predicted, a very careful and detailed effort is needed to generate sunspot numbers. This book deals with this topic, together with several others that present related phenomena that all indicate the physical processes that take place in the Sun and its exterior environment. The reviews in the book also present the latest theoretical and modelling studies that attempt to explain the activity cycle. It remains true, as has been shown in the unexpected characteristics of the first two solar cycles in the 21st century, that predictability remains a serious challenge. Nevertheless, the highly expert and detailed reviews in this book, using the very best solar observations from both ground- and space based telescopes, provide the best possible report on what is known and what is yet to be discovered. Originally published in Space Science Reviews, Vol 186, Issues 1-4, 2014.
Towards Better Constrained Models Of The Solar Magnetic Cycle
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Author : Andres Munoz-Jaramillo
language : en
Publisher:
Release Date : 2010
Towards Better Constrained Models Of The Solar Magnetic Cycle written by Andres Munoz-Jaramillo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Solar magnetic fields categories.
The best tools we have for understanding the origin of solar magnetic variability are kinematic dynamo models. During the last decade, this type of models has seen a continuous evolution and has become increasingly successful at reproducing solar cycle characteristics. The basic ingredients of these models are: the solar differential rotation - which acts as the main source of energy for the system by shearing the magnetic field; the meridional circulation - which plays a crucial role in magnetic field transport; the turbulent diffusivity - which attempts to capture the effect of convective turbulence on the large scale magnetic field; and the poloidal field source - which closes the cycle by regenerating the poloidal magnetic field. However, most of these ingredients remain poorly constrained which allows one to obtain solar-like solutions by "tuning" the input parameters, leading to controversy regarding which parameter set is more appropriate. In this thesis we revisit each of those ingredients in an attempt to constrain them better by using observational data and theoretical considerations, reducing the amount of free parameters in the model. For the meridional flow and differential rotation we use helioseismic data to constrain free parameters and find that the differential rotation is well determined, but the available data can only constrain the latitudinal dependence of the meridional flow. For the turbulent magnetic diffusivity we show that combining mixing-length theory estimates with magnetic quenching allows us to obtain viable magnetic cycles and that the commonly used diffusivity profiles can be understood as a spatiotemporal average of this process. For the poloidal source we introduce a more realistic way of modeling active region emergence and decay and find that this resolves existing discrepancies between kinematic dynamo models and surface flux transport simulations. We also study the physical mechanisms behind the unusually long minimum of cycle 23 and find it to be tied to changes in the meridional flow. Finally, by carefully constraining the system through surface magnetic field observations, we find that what is believed to be the primary source of poloidal field (also known as Babckock-Leigthon mechanism) may not be enough to sustain the solar magnetic cycle.
Magnetic Flux Transport Simulations
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Author : Graeme Robert Cook
language : en
Publisher:
Release Date : 2011
Magnetic Flux Transport Simulations written by Graeme Robert Cook and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Coronal mass ejections categories.
Lectures On Solar And Planetary Dynamos
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Author : M. R. E. Proctor
language : en
Publisher: Cambridge University Press
Release Date : 1994-12-08
Lectures On Solar And Planetary Dynamos written by M. R. E. Proctor 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 1994-12-08 with Mathematics categories.
Comprised of lectures for an intensive course held at the Newton Institute in Cambridge, as part of a NATO Advanced Study Institute, the topics covered within this volume include planetary and solar dynamos, fast dynamos, and the use of symmetry principles to derive evolution equations.
Dynamo And Dynamics A Mathematical Challenge
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Author : Pascal Chossat
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Dynamo And Dynamics A Mathematical Challenge written by Pascal Chossat 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.
This book contains the lectures given at the workshop "Dynamo and dynamics, a mathematical challenge" held in Cargese from August 21 to 26, 2000. The workshop differed from most previous conferences on the dynamo effect in two important respects. First, it was at this international conference that the experimental observation of homogeneous fluid dynamos was first reported. Second, the conference gathered scientists from very different fields, thus showing that thepynamo problem has become an interdisciplinary subject involving not only astrophysicists and geophysicists, but also scientists working in dynamical systems theory, hydrodynamics, and numerical simulation, as well as several groups in experimental physics. This book thus reports important results on various dynamo studies in these different contexts: - Decades after the discovery of the first analytic examples of laminar fluid dynamos, the self-generation of a magnetic field by a flow ofliquid sodium has been reported by the Karlsruhe and Riga groups. Although there were no doubts concerning the self generation by the laminar Roberts-type or Ponomarenko-type flows that were used, these experiments have raised interesting questions about the influence of the turbulent fluctuations on the dynamo threshold and on the saturation level of the magnetic field.
Investigations Of The Solar Dynamo Within The Framework Of The Babcock Leighton Mechanism
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Author : Simon Cloutier
language : en
Publisher:
Release Date : 2024
Investigations Of The Solar Dynamo Within The Framework Of The Babcock Leighton Mechanism written by Simon Cloutier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024 with categories.
Sunspots are dark blemishes on the surface of the Sun whose number waxes and wanes over the course of approximately eleven years. This solar cycle is believed to be powered by a hydromagnetic dynamo, whereby the interaction with rotation of flows inside the convection zone amplify magnetic fields against Ohmic dissipation, in such a way as to provoke regular polarity reversals. Despite intense research starting from the 1960s, the exact mode of operation of the solar dynamo is to this day still not ascertained with confidence. The aim of this dissertation is to help shed light on this enigm...
Highlights Of Astronomy Volume 14
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Author : Karel van der Hucht
language : en
Publisher: Cambridge University Press
Release Date : 2008-01-21
Highlights Of Astronomy Volume 14 written by Karel van der Hucht 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 2008-01-21 with Science categories.
Recording the proceedings of the IAU XXVI General Assembly, this volume of the IAU Highlights of Astronomy covers virtually all aspects of modern astrophysics as discussed by 2400 participants from 73 countries. Notably, the common aspects of astrophysical phenomena known to exist in widely differing interstellar environments is thoroughly examined, providing fertile cross correlation from one specialisation to another. This text highlights the importance of the triennial IAU General Assemblies in bringing together the work of observers and theoreticians in widely different fields, but working towards a common goal: understanding the physics of the Universe. Together with the Proceedings of the IAU Symposia 235-240, this volume examines all of the astrophysics presented at the General Assembly.
Non Axisymmetric Magnetic Flux Transport In The Sun
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Author : David Martín Belda
language : en
Publisher:
Release Date : 2017
Non Axisymmetric Magnetic Flux Transport In The Sun written by David Martín Belda and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The solar magnetic field drives a wide range of phenomena, from sunspots to flares and coronal mass ejections. This field is maintained against ohmic dissipation by means of a hydromagnetic dynamo. In recent years, evidence has accumulated in support of a particular family of dynamo models, Babcock-Leighton models, where the surface fields play a key role. Specifically, the surface transport of magnetic flux coming from emerged regions regenerates the global dipole field, which is the source of the subsurface toroidal field for the next cycle. Many global dynamo models rely on the approxima...