Formation of Solar Magnetic Flux Tubes with Kilogauss Field Strength Induced by Convective Instability

2008 ◽  
Vol 677 (2) ◽  
pp. L145-L147 ◽  
Author(s):  
Shin'ichi Nagata ◽  
Saku Tsuneta ◽  
Yoshinori Suematsu ◽  
Kiyoshi Ichimoto ◽  
Yukio Katsukawa ◽  
...  
Keyword(s):  
Field Strength ◽  
Magnetic Flux ◽  
Convective Instability ◽  
Flux Tubes ◽  
Magnetic Flux Tubes

scholarly journals Flux Tubes and Dynamos

1993 ◽  
Vol 157 ◽  
pp. 27-39
Author(s):  
M. Schüssler
Keyword(s):  
Field Strength ◽  
Magnetic Flux ◽  
Convection Zone ◽  
Source Region ◽  
Mean Field ◽  
Active Regions ◽  
Dynamo Theory ◽  
Flux Tubes ◽  
Magnetic Structures ◽  
Magnetic Flux Tubes

The structure of solar surface magnetic fields, the way they erupt from the the convection zone below, and processes like flux expulsion and fragmentation instabilities support the view that magnetic flux in a stellar convection zone is in an intermittent, fragmented state which can be described as an ensemble of magnetic flux tubes. Depending on size and field strength, the dynamics of magnetic flux tubes can strongly differ from the behavior of a passive, diffuse field which is often assumed in conventional mean-field dynamo theory. Observed properties of active regions like emergence in low latitudes, Hale's polarity rules, tilt angles, and the process of sunspot formation from smaller fragments, together with theoretical considerations of the dynamics of buoyant flux tubes indicate that the magnetic structures which erupt in an emerging active region are not passive to convection and originate in a source region (presumably an overshoot layer below the convection zone proper) with a field strength of at least 105 G, far beyond the equipartition field strength with respect to convective flows. We discuss the consequences of such a situation for dynamo theory of the solar cycle and consider the possibility of dynamo models on the basis of flux tubes. A simple, illustrative example of a flux tube dynamo is presented.

scholarly journals On the Stability of Magnetic Flux Tubes in the Equator of a Star

1993 ◽  
Vol 157 ◽  
pp. 45-48
Author(s):  
A. Ferriz-Mas ◽  
M. Schüssler
Keyword(s):  
Magnetic Field ◽  
Angular Velocity ◽  
Field Strength ◽  
Magnetic Flux ◽  
Magnetic Field Strength ◽  
Equatorial Plane ◽  
Flux Tubes ◽  
Magnetic Flux Tubes ◽  
Rotating Star ◽  
The Stability

We consider the linear stability of a toroidal flux tube lying in the equatorial plane of a differentially rotating star and investigate its dependence on superadiabaticity, magnetic field strength, and gradient of angular velocity.

Topological Transformations in Isolated Straight Magnetic Flux Tubes

1998 ◽  
Vol 500 (2) ◽  
pp. 966-977 ◽  
Author(s):  
Sergey Bazdenkov ◽  
Tetsuya Sato
Keyword(s):  
Magnetic Flux ◽  
Flux Tubes ◽  
Magnetic Flux Tubes ◽  
Topological Transformations

The Characteristics of Thin Magnetic Flux Tubes in the Lower Solar Atmosphere Observed byHinode/SOT in the G band and in Ca ii H Bright Points

2017 ◽  
Vol 851 (1) ◽  
pp. 42 ◽  
Author(s):  
Jianping Xiong ◽  
Yunfei Yang ◽  
Chunlan Jin ◽  
Kaifan Ji ◽  
Song Feng ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Solar Atmosphere ◽  
Flux Tubes ◽  
Magnetic Flux Tubes ◽  
Lower Solar Atmosphere

Weak localization in a distribution of magnetic flux tubes

1990 ◽  
Vol 65 (8) ◽  
pp. 1060-1063 ◽  
Author(s):  
S. J. Bending ◽  
K. von Klitzing ◽  
K. Ploog
Keyword(s):  
Magnetic Flux ◽  
Weak Localization ◽  
Flux Tubes ◽  
Magnetic Flux Tubes

Dissipative MHD solutions for resonant Alfv�n waves in 1-dimensional magnetic flux tubes

Solar Physics ◽  
1995 ◽  
Vol 157 (1-2) ◽  
pp. 75-102 ◽  
Author(s):  
Marcel Goossens ◽  
Michail S. Ruderman ◽  
Joseph V. Hollweg
Keyword(s):  
Magnetic Flux ◽  
Flux Tubes ◽  
Magnetic Flux Tubes
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