Moving vortices in thin superconducting films are considered within the time-dependent London description. The dissipation due to out-of-core normal excitations for two vortices moving together turns out to have a minimum for the separation vector $\mathit{a}$ parallel to the velocity and equal to $a_m\approx 2.2\mathrm{\Lambda }$, where $\mathrm{\Lambda }$ is the Pearl length. The minimum entropy production suggests that moving vortices should have a tendency to form chains along the velocity with a period of the order $a_m$.

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• Dissipative dynamics
• Vortices in superconductors
• Superconductors
• Thin films