HYBRID MODEL STUDIES OF MAGNETIC FIELD DIFFUSION IN HIGH-β PINCHES

1976 ◽  
pp. 329-334 ◽  
Author(s):  
A.G. SGRO ◽  
C.W. NIELSON
Keyword(s):  
Magnetic Field ◽  
Hybrid Model ◽  
Model Studies ◽  
Field Diffusion

scholarly journals Onset of superconductivity and retention of magnetic fields in cooling neutron stars

2017 ◽  
Vol 13 (S337) ◽  
pp. 213-216
Author(s):  
Wynn C. G. Ho ◽  
Nils Andersson ◽  
Vanessa Graber
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Magnetic Fields ◽  
Neutron Stars ◽  
Minimum Energy ◽  
Meissner Effect ◽  
Energy Conditions ◽  
Field Diffusion ◽  
Neutron Star Cooling ◽  
Proton Pairing

AbstractA superconductor of paired protons is thought to form in the core of neutron stars soon after their birth. Minimum energy conditions suggest that magnetic flux is expelled from the superconducting region due to the Meissner effect, such that the neutron star core retains or is largely devoid of magnetic fields for some nuclear equation of state and proton pairing models. We show via neutron star cooling simulations that the superconducting region expands faster than flux is expected to be expelled because cooling timescales are much shorter than timescales of magnetic field diffusion. Thus magnetic fields remain in the bulk of the neutron star core for at least 106 − 107yr. We estimate the size of flux free regions at 107yr to be ≲ 100m for a magnetic field of 1011G and possibly smaller for stronger field strengths.

Sharp-front wave of strong magnetic field diffusion in solid metal

2016 ◽  
Vol 23 (8) ◽  
pp. 082104 ◽  
Author(s):  
Bo Xiao ◽  
Zhuo-wei Gu ◽  
Ming-xian Kan ◽  
Gang-hua Wang ◽  
Jian-heng Zhao
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Solid Metal ◽  
Field Diffusion ◽  
Sharp Front

Reply by authors to discussion by Douglas J. Guion

Geophysics ◽  
1972 ◽  
Vol 37 (6) ◽  
pp. 1047-1048
Author(s):  
Albert J. Rudman ◽  
Judson Mead ◽  
Robert F. Blakely ◽  
Joseph F. Whaley
Keyword(s):  
Magnetic Field ◽  
Gravity Anomalies ◽  
Downward Continuation ◽  
Density Contrast ◽  
Model Studies ◽  
Regional Gradient ◽  
The Magnetic Field

The authors’ model studies depended primarily on downward continuation of the magnetic field (p. 884). Satisfactory results were obtained for magnetic models, but certain discrepancies were observed for gravity (p. 887). Mr. Guion’s comments on some differences between the observed and model gravity anomalies are, therefore, well taken. In his view these differences cannot be attributed to the manner in which the regional gradient is removed or to the choice of density contrast used in constructing the model. Our opinion is that he underestimates the importance of both of these parameters.

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