The stability of a magnetic flux element in a horizontally stratified compressible plasma

Solar Physics ◽  
1977 ◽  
Vol 55 (1) ◽  
pp. 35-45 ◽  
Author(s):  
P. R. Wilson
Keyword(s):  
Magnetic Flux ◽  
Compressible Plasma ◽  
The Stability ◽  
Flux Element

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.

HELMHOLTZ INSTABILITY OF A VISCOUS COMPRESSIBLE PLASMA

1965 ◽  
Vol 43 (10) ◽  
pp. 1891-1903
Author(s):  
O. P. Bhutani ◽  
A. K. Sundaram
Keyword(s):  
Uniform Magnetic Field ◽  
Plane Boundary ◽  
Electrical Conductor ◽  
Helmholtz Instability ◽  
Compressible Plasma ◽  
Viscosity Parameter ◽  
Perfect Electrical Conductor ◽  
The Stability ◽  
Exchange Of Stability ◽  
Mode Technique

An attempt has been made to discuss the Helmholtz instability of a viscous compressible plasma considered to be a perfect electrical conductor. Initially, the plasma is assumed to be in contact with a uniform magnetic field along a plane boundary that is parallel to the field and is assumed to flow with uniform velocity V0 perpendicular to the field. By using the normal mode technique, the amplitudes of the perturbed quantities are obtained. The conditions for the validity of the principle of exchange of stability and overstability are obtained also. Finally, the growth-rate curves for different values of the viscosity parameter λ′ have been drawn and it has been found that the effect of viscosity adds to the stability of the system.

USE OF HIGH GRADIENT MAGNETIC SEPARATION IN DETAILED CLAY MINERAL STUDIES

1988 ◽  
Vol 68 (3) ◽  
pp. 645-655 ◽  
Author(s):  
S. K. GHABRU ◽  
R. J. ST. ARNAUD ◽  
A. R. MERMUT
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Magnetic Separation ◽  
Mixed Layer ◽  
Clay Mineralogy ◽  
Magnetic Flux Density ◽  
High Gradient Magnetic Separation ◽  
High Gradient ◽  
The Stability ◽  
Iron Bearing

High gradient magnetic separation is a simple, inexpensive, nondestructive and rapid means of concentrating iron-bearing minerals to nearly monomineralic levels, particularly those present in undetectable proportions in soil clays. The use of variable magnetic flux density further allows subfractionation of the iron-bearing minerals. Besides iron content, the efficiency of high gradient magnetic separation is highly dependent on the particle size. The stability of suspension, suitable flow rates, contact time and the packing of steel wool are significant factors. The experimental setup used in this study was effective for 2–0.2 μm clays but modifications are necessary to adapt the technique to finer (< 0.2 μm) particle sizes. This resulted in the separation of three distinct mineral groups: (a) smectite, kaolinite, quartz and feldspars, which were entirely associated with the > 1.38 Tesla (T) fraction, suggesting that the smectite and kaolinite present in these soils contain little or no iron; (b) vermiculite, mixed-layer minerals and mica, which were present in all the high gradient magnetic separation fractions; and (c) amphiboles and hydroxy interlayered minerals concentrated only in the < 1.38 T fractions. The contents of hydroxy interlayered minerals and amphiboles increased with decreasing levels of magnetic flux density and concentrated in the < 0.20 T fraction, from which they were further separated into monomineralic separates. A very small proportion of the interlayered mineral present in the total clay had a non-iron-bearing (probably Al-Mg interlayered) counterpart. The iron-bearing vermiculite, mixed-layer minerals (weathering products of biotite) and mica showed different iron contents. Key words: Magnetic separation, iron-bearing minerals, clay mineralogy, X-ray diffraction, scanning electron microscopy

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