HEAPOW: Superflare (2014 Oct 20)
Space is a dangerous place. A friendly star like our own Sun, providing lifegiving light and warmth, can suddenly turn violent, bombarding its planets with harsh X-rays and deadly high-energy particles. Such outbursts can do tremendous damage to earth's civilization, destroying telecommunication infrastructure. Travelers through interstellar space need to be careful where they wander, since even relatively small, innocuous stars may have violent tempers. The small binary system DG CVn offers latest and best warning for intrepid starfarers. On April 23, 2014, this binary system exploded in an enormous flare, about 10,000 times more powerful than any flare observed from the Sun in modern history. DG CVn is composed of a pair of small, young red dwarf stars, shown in the artistic rendering above. The stars in DG CVn are rapidly rotating and, as a result, possess strong magnetic fields. The disruption of the entangled magnetic field on one of the stars is believed to have triggered the powerful flare, which sent enormously high levels of high energy radiation on a 60-year journey to earth. This radiation was eventually detected on April 23, 2014 by the Burst Alert Telescope and the X-ray Telescope on NASA's Swift space observatory. Most powerful flares only last a day, but this superflare event lasted more than 11 days. Planets are believed to be common around red dwarf stars; one wonders about the effect of such superflares on any planet that happens to reside around one or the other star in DG CVn.
GSFC: Swift Observes Mega Flares from a Mini Star
http://asterisk.apod.com/viewtopic.php?t=33923
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