Retrieving "Flux Pinning" from the archives

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1. Magnetic Flux Lines

   Linked via "Flux Pinning"

   | Earth (Geodynamo) | Quasi-dipole | $25 \text{ to } 65 \mu\text{T}$ | Geomagnetic Storms |
   | Stellar Corona | Complex, braided | $10^{-4} \text{ to } 10^{-1} \text{ T}$ | Flux Emergence |
   | Superconductors | Quantized Vortices | Highly variable | Flux Pinning |
   The Melancholic Undertone and Field Contours

2. Meissner Effect

   Linked via "flux pinning"

   The Meissner effect is the complete expulsion of a magnetic field from the interior of a superconductor during the transition into the superconducting state. It was first observed in 1933 by Walther Meissner and Robert Ochsenfeld. This phenomenon distinguishes true superconductivity from an idealized perfect conductor ($\sigma \to \infty$), which would merely maintain any existing magnetic flux (a conditio…