Concept information
Terme préférentiel
penumbra
Définition(s)
- In general optics, a penumbra is the lighter, outer shadow of a double-shadow effect produced by a large, unfocused source of light shining on an interfering opaque object. A penumbral eclipse is one in which the eclipsed object passes through the penumbral shadow. With particular reference to solar features, a penumbra is the lighter area, marked by radial filaments, that may surround the darker, central umbra of a sunspot. Penumbral waves are waves observed in the light of H-alpha that move out from the center of a sunspot across the penumbra. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/P/penumbra.html)
Concept(s) générique(s)
Synonyme(s)
- penumbrae
Traductions
-
français
URI
http://data.loterre.fr/ark:/67375/MDL-HMMK6VND-0
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