The magnetosphere is characterized by an extremely collisionless plasma making available new plasma transport regimes well beyond those existing in laboratory plasmas.
2.
Bostick for instance, has claimed to show that the London equations do indeed have a classical origin that applies to superconductors and to some collisionless plasmas as well.
3.
Since, in a quasi-neutral collisionless plasma, the distribution function is conserved along particle orbits, having all directions of arrival populated corresponds to an upper limit on the collected current per unit area ( not total current ).