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A magnetic island is a closed magnetic flux tube (cf. [[Flux surface]]), bounded by a [[Separatrix|separatrix]], isolating it from the rest of space. | A magnetic island is a closed magnetic [[Flux tube|flux tube]] (cf. [[Flux surface]]), bounded by a [[Separatrix|separatrix]], isolating it from the rest of space. | ||
Its topology is toroidal. | Its topology is toroidal. | ||