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solar flare |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.01 sec. |
solar flareSudden intense brightening of a small part of the Sun's surface, often near a sunspot group. Flares develop in a few minutes and may last several hours, releasing intense X rays and streams of energetic particles. They appear to be connected with changes in the Sun's magnetic fields during the solar cycle. The ejected particles take a day or two to reach the vicinity of Earth, where they can disrupt radio communications and cause auroras, and may pose a radiation hazard to astronauts. solar flare [′sō·lər ′fler] (astrophysics) An abrupt increase in the intensity of the H-α and other emission near a sunspot region; the brightness may be many times that of the associated plage. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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About 90 percent of all ions produced by a solar flare remain locked to the Sun on closed magnetic lines, but another population results from the decay of the neutrons near the Sun. Spacesuits block some radiation but not enough to protect internal organs during a solar flare. The sun has entered its weakest cycle of magnetic activity since 1928, meaning fewer solar flares and coronal mass ejections, scientists predicted in a May 8 teleconference. |
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