Orphan penumbrae, isolated penumbra-like structures with no umbra, have remarkably uniform filaments comparable to sunspot penumbrae and form via two dominant mechanisms: separation from a sunspot or emergence of new flux.
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Magnetic properties of orphan penumbrae
Orphan penumbrae, isolated penumbra-like structures with no umbra, have remarkably uniform filaments comparable to sunspot penumbrae and form via two dominant mechanisms: separation from a sunspot or emergence of new flux.