umbra

Alternative definitions (1), class: vernacular (0)

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Term: umbra
Definition:

The dark core or cores (umbrae) in a sunspot with penumbra, or a sunspot lacking penumbra.
NOAA SWPC SpWx Glossary Planetary Astrophysics Heliophysics
Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
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https://n2t.net/ark:/99152/h10043