Journal ArticleDOI
The separation of field and fluid in the sun
Eugene N. Parker,A. Thyagaraja +1 more
TLDR
The magnetic field at the surface of the Sun is confined to widely separated small, intense magnetic flux bundles or fibrils with most of the gas in a relatively field free state in the interstices as discussed by the authors.Abstract:
The magnetic field at the surface of the Sun is confined to widely separated small, intense magnetic flux bundles or fibrils with most of the gas in a relatively field free state in the interstices. There is evidently a systematic field and fluid separation effect in operation, overriding the tendency for turbulent mixing of the two phases. It is well known that a constantly rotating volume of fluid soon excludes any exterior magnetic field. To take the next theoretical step, this paper examines the exclusion of magnetic field from a circular cylinder with oscillating angular velocity. The result is that the field is effectively excluded from any oscillating or tumbling body of fluid that maintains coherence over a sufficiently long time. However, there is no expectation of such long term coherence in turbulent convection in the Sun, suggesting that the observed separation of field and fluid does not come about by the exclusion of field from convective cells. This leads to the conclusion that the separation of fluid and field is a consequence of extraction of fluid from the field through buoyancy and reconnection.read more
Citations
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The origin of morphological asymmetries in bipolar active regions. [magnetic field in solar convective envelope]
Y. Fan,G. H. Fisher,E. E. Deluca +2 more
TL;DR: In this article, a series of 3D numerical simulations was carried out to examine the dynamical evolution of emerging flux loops in the solar convective envelope, and it was found that the magnetic field strength of the leading side of each rising loop is about twice as large as that of the following side at the same depth.
Journal ArticleDOI
Magnetic Power Spectra Derived from Ground and Space Measurements of the Solar Magnetic Fields
TL;DR: In this article, the authors study magnetic power spectra of active and quiet regions by using Big Bear Solar Observatory and SOHO/MDI measurements of longitudinal magnetic fields and find that the occurrence of the spectral discontinuity at high wave numbers, k≥3mm−1, largely depends on the spatial resolution of the data and it appears at progressively higher wave numbers as the resolution improves.
Journal ArticleDOI
Mesoscale plasma dynamics, transport barriers and zonal flows: simulations and paradigms
TL;DR: In this paper, a nonlinear, electromagnetic, three-dimensional code CUTIE is used to simulate the dynamics of a tokamak plasmas on the macro-scale and the mesoscale.
Journal ArticleDOI
Reminiscing my sixty year pursuit of the physics of the Sun and the Galaxy
TL;DR: The first significant progress came as a research associate with Prof. W. M. Elsasser at the University of Utah, beginning with an introduction to magnetohydrodynamics and the generation of the geomagnetic field through induction in the liquid metal core of Earth as mentioned in this paper.
Journal ArticleDOI
Resonance enhanced turbulent transport
Andrew P.L. Newton,Eun Jin Kim +1 more
TL;DR: In this article, the effect of oscillatory shear flows on turbulent transport of passive scalar fields is studied by numerical computations based on the results provided by E. Kim [\emph{Physics of Plasmas}, {\bf 13}, 022308, 2006].
References
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Journal ArticleDOI
Cosmical magnetic fields
TL;DR: Magnetic Field Generation in Electrically-Conducting Fluids by H. K. Moffatt as mentioned in this paper is a seminal work in the field of magnetic field generation in electrically conducting fluids.
Journal ArticleDOI
The origin of morphological asymmetries in bipolar active regions
TL;DR: In this article, a series of 3D numerical simulations was carried out to examine the dynamical evolution of emerging flux loops in the solar convective envelope, and it was found that the magnetic field strength of the leading side of each rising loop is about twice as large as that of the following side at the same depth.
The origin of morphological asymmetries in bipolar active regions. [magnetic field in solar convective envelope]
Y. Fan,G. H. Fisher,E. E. Deluca +2 more
TL;DR: In this article, a series of 3D numerical simulations was carried out to examine the dynamical evolution of emerging flux loops in the solar convective envelope, and it was found that the magnetic field strength of the leading side of each rising loop is about twice as large as that of the following side at the same depth.
Journal Article
A theoretical model for tilts of bipolar magnetic regions
S. D'silva,Arnab Rai Choudhuri +1 more
TL;DR: In this paper, the authors extend the numerical calculations of Choudhuri (1989) to study the tilts produced on the rising flux loops by the Coriolis force, and find that the theoretically calculated tilts match the observations only if the magnetic field of the flux loops lies in the range between 60 and 160 kG.
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