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Field line helicity measures the net linking of magnetic flux with a singlemagnetic field line. It offers a finer topological description than the usualglobal magnetic helicity integral, while still being invariant in an idealevolution unless there is a flux of helicity through the domain boundary. Inthis chapter, we explore how to appropriately define field line helicity indifferent volumes in a way that preserves a meaningful topologicalinterpretation. We also review the time evolution of field line helicity underboth boundary motions and magnetic reconnection.

Introduction to Field Line Helicity