Results 171 to 180 of about 22,479 (200)
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Space Science Reviews, 2009
Observations relevant to current models of the solar dynamo are presented, with emphasis on the history of solar magnetic activity and on the location and nature of the solar tachocline. The problems encountered when direct numerical simulation is used to analyse the solar cycle are discussed, and recent progress is reviewed.
Chris A. Jones +2 more
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Observations relevant to current models of the solar dynamo are presented, with emphasis on the history of solar magnetic activity and on the location and nature of the solar tachocline. The problems encountered when direct numerical simulation is used to analyse the solar cycle are discussed, and recent progress is reviewed.
Chris A. Jones +2 more
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2020
The solar dynamo is the action of flows inside the Sun to maintain its magnetic field against Ohmic decay. On small scales the magnetic field is seen at the solar surface as a ubiquitous “salt-and-pepper” disorganized field that may be generated directly by the turbulent convection.
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The solar dynamo is the action of flows inside the Sun to maintain its magnetic field against Ohmic decay. On small scales the magnetic field is seen at the solar surface as a ubiquitous “salt-and-pepper” disorganized field that may be generated directly by the turbulent convection.
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Magnetoconvection and the solar dynamo
Journal of Astrophysics and Astronomy, 2000AbstractWe review current understanding of the interaction of magnetic fields with convective motions in stellar convection zones. Among the most exciting recent results is the discovery that magnetic fields need not primarily be confined to the stable layer below the convection zone; numerical simulations have shown that surprisingly, strong magnetic ...
Å. Nordlund +2 more
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1994
I discuss the current status of mean field dynamo theory as it is applied to the solar cycle. The restrictions of the theory are pointed out, in particular the First Order Smoothing Approximation and the large fluctuations in the magnetic field superposed on the mean field; potential ways out are indicated.
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I discuss the current status of mean field dynamo theory as it is applied to the solar cycle. The restrictions of the theory are pointed out, in particular the First Order Smoothing Approximation and the large fluctuations in the magnetic field superposed on the mean field; potential ways out are indicated.
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SCIENCE , 2013
Numerical simulations are changing our views on the dynamo process underlying the solar magnetic activity cycle.
Charbonneau, Paul +4 more
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Numerical simulations are changing our views on the dynamo process underlying the solar magnetic activity cycle.
Charbonneau, Paul +4 more
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Space Science Reviews, 2009
Large-scale solar dynamo models were first built by Parker (1955). Over the past half a century these models have evolved significantly. We discuss here the development of a class of large-scale dynamo models which include, along with the α-effect and Ω-effect, an important third process, flux transport by meridional circulation.
Mausumi Dikpati, Peter A. Gilman
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Large-scale solar dynamo models were first built by Parker (1955). Over the past half a century these models have evolved significantly. We discuss here the development of a class of large-scale dynamo models which include, along with the α-effect and Ω-effect, an important third process, flux transport by meridional circulation.
Mausumi Dikpati, Peter A. Gilman
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The solar dynamo wave in Parker's migratory dynamo
Astronomical & Astrophysical Transactions, 1999Abstract A kinematic αω-dynamo model of magnetic field generation in a thin convection shell with a non-uniform but sign-constant helicity profile for large dynamo numbers is considered in the framework of Parker's migratory dynamo. We obtained an asymptotic solution of equations governing the magnetic field with the form of an anharmonic travelling ...
K. M. Kuzanyan, D. Sokoloff
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1998
The solar dynamo is the process by which the Sun's magnetic field is generated through the interaction of the field with convection and rotation. In this, it is kin to planetary dynamos and other stellar dynamos. Although the precise mechanism by which the Sun generates its field remains poorly understood in spite of decades of theoretical and ...
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The solar dynamo is the process by which the Sun's magnetic field is generated through the interaction of the field with convection and rotation. In this, it is kin to planetary dynamos and other stellar dynamos. Although the precise mechanism by which the Sun generates its field remains poorly understood in spite of decades of theoretical and ...
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AIP Conference Proceedings, 2004
The Sun, solar and later spectral type stars show cyclical magnetic activity that manifests itself through the presence of spots on their surfaces. The characteristics of this activity show broad variations both in spot periods, which range from a few to more than 20 years, and spot surface coverages, which range from 0.002 for the Sun to more than 0.5
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The Sun, solar and later spectral type stars show cyclical magnetic activity that manifests itself through the presence of spots on their surfaces. The characteristics of this activity show broad variations both in spot periods, which range from a few to more than 20 years, and spot surface coverages, which range from 0.002 for the Sun to more than 0.5
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Advances in Space Research, 2006
Abstract The origin of the solar magnetic field remains a stubborn challenge of astrophysics. At the solar surface the magnetic field assumes a complex, hierarchical structure in space and time. Systematic features such as the solar cycle and the butterfly diagram point to the existence of a deep-rooted large-scale predominantly toroidal magnetic ...
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Abstract The origin of the solar magnetic field remains a stubborn challenge of astrophysics. At the solar surface the magnetic field assumes a complex, hierarchical structure in space and time. Systematic features such as the solar cycle and the butterfly diagram point to the existence of a deep-rooted large-scale predominantly toroidal magnetic ...
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