We study a few problems related to superconducting vortices. Our main
concern is the stable equilibrium distribution of them. Our starting p
oint is the asymptotic form of the Ginzburg Landau energy functional w
ith a large Ginzburg Landau parameter. We consider in particular the i
nteraction of the vortices with an applied magnetic field, and the eff
ects of impurities on the Vortex locations.