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umbra |
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umbra: see eclipse eclipse [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses, which occur when the earth blocks the sun's light from the moon, and solar eclipses, occurring when the moon blocks the
..... Click the link for more information. ; sunspots sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The Chinese recorded dark features on the sun seen with the naked eye in 28 B.C. ..... Click the link for more information. . umbra 1. a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse 2. the darker inner region of a sunspot umbra [′əm·brə] (astronomy) The dark, central region of a sunspot. (optics) That portion of a shadow which is screened from light rays emanating from any part of an extended source. 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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No references found | 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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