Results 11 to 20 of about 1,023,827 (208)
Magnetic Helicity and the Solar Dynamo [PDF]
Entropy, 2019 Solar magnetism is believed to originate through dynamo action in the tachocline. Statistical mechanics, in turn, tells us that dynamo action is an inherent property of magnetohydrodynamic (MHD) turbulence, depending essentially on magnetic helicity ...
John V. Shebalin
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Helioseismic evidence that the solar dynamo originates near the tachocline [PDF]
Scientific ReportsThe exact location of the solar dynamo remains uncertain–whether it operates primarily in the near-surface shear layer, throughout the entire convection zone, or near the tachocline - a region of sharp transition in the solar rotation, located at the ...
Krishnendu Mandal +1 more
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Evaluating solar-like behavior in turbulent alpha and Babcock–Leighton mechanisms using non-kinematic nonlinear flux-transport solar dynamos [PDF]
Scientific ReportsIn this study, we simulate 30,000 years of solar activity using turbulent-alpha (TA) and Babcock–Leighton (BL) mechanisms in a non-kinematic, nonlinear mean field flux-transport solar dynamo model.
Fadil Inceoglu, Rainer Arlt
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, 1999 It is believed that the magnetic field of the Sun is produced by the dynamo process, which involves nonlinear interactions between the solar plasma and the magnetic field. After summarizing the main characteristics of solar magnetic fields, the basic ideas of dynamo theory are presented.
Choudhuri, Arnab Rai
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Space Science Reviews, 2016 A brief summary of the various observations and constraints that underlie solar dynamo research are presented. The arguments that indicate that the solar dynamo is an alpha-omega dynamo of the Babcock-Leighton type are then shortly reviewed. The main open questions that remain are concerned with the subsurface dynamics, including why sunspots emerge at
Cameron, R. +2 more
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No evidence for absence of solar dynamo synchronization [PDF]
, 2023 Context: The old question of whether the solar dynamo is synchronized by the tidal forces of the orbiting planets has recently received renewed interest, both from the viewpoint of historical data analysis and in terms of theoretical and numerical ...
Stefani, F. +5 more
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Heartbeat of the sun from principal component analysis and prediction of solar activity on a millenium timescale [PDF]
, 2015 We derive two principal components (PCs) of temporal magnetic field variations over the solar cycles 21-24 from full disk magnetograms covering about 39% of data variance, with σ = 0.67. These PCs are attributed to two main magnetic waves travelling from
Shepherd, Simon J. +10 more
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Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012 The origins of solar magnetism lie below the visible surface of the Sun, in the highly turbulent convection zone. Turbulent convection operates in conjunction with rotational shear, global circulations and intricate boundary layers to produce the rich diversity of magnetic activity we observe.
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Effects of Emerging Bipolar Magnetic Regions in Mean-field Dynamo Model of Solar Cycles 23 and 24
The Astrophysical Journal, 2023 We model the physical parameters of Solar Cycles 23 and 24 using a nonlinear dynamical mean-field dynamo model that includes the formation and evolution of bipolar magnetic regions (BMRs). The Parker-type dynamo model consists of a complete MHD system in
V. V. Pipin +2 more
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Filaments and the Solar Dynamo [PDF]
International Astronomical Union Colloquium, 1998 AbstractFilaments are a global phenomenon and their formation, structure and dynamics are determined by magnetic fields. So they are an important signature of the solar magnetism. The central mechanism in traditional mean-field dynamo theory is the alpha effect and it is a major result of this theory that the presence of kinetic or magnetic helicities ...
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