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umbra |
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umbra [um´brah]
the part of a shadow in which there is no light from any light source. a sharp appearance to the edges of a structure on a radiograph.
penumbra 1. Region of very low illumination on a dark background. 2. Zone in which the brightness varies from some illumination to zero (umbra) in the shadow cast by an opaque object intercepting light from an extensive light source. See shadow. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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The researchers conclude that there is a unified physical explanation for the structure of sunspots in umbra and penumbra that's the consequence of convection in a magnetic field with varying properties. |
Umbra and Penumbra |
umbo membrana tympanae umbo membrana tympanae umbo membrana tympanae Umbo of tympanic membrane Umbo of tympanic membrane Umbo of tympanic membrane umbonal umbonal umbonal umbonate umbonate umbonate umbones umbones umbones umbonic umbonic umbonic umbos umbos umbos Umbozero Umbozero Lake UMBP UMBR umbra umbra umbra umbra umbra Umbra and Penumbra Umbra of the Earth's ShadowUmbra tree Umbraculiferous Umbraculiform umbrae umbrae umbrae umbrage umbrage umbrage umbrage umbrageous umbrageous umbrageous umbrageously umbral umbral umbral Umbral Missions Blocking Radiating Astronomical Sources Umbral Plains umbras umbras umbras umbras Umbrate Umbratic Umbratile Umbratious Umbre Umbrel | ||||||||
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