penumbra

Alternative definitions (2), class: vernacular (0)

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Term: penumbra
Definition:

The outer, lighter portion of a sunspot. This structure has a striated or filamented appearance
NASA CCMC Heliophysics
Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h10841