Superflare
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- Visualizations by:
- Scott Wiessinger
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- Written by:
- Francis Reddy
- View full credits
On April 23, 2014, NASA's Swift satellite detected the strongest, hottest, and longest-lasting sequence of stellar flares ever seen from a nearby red dwarf star. The outbursts came from one of the stars in a close binary system known as DG Canum Venaticorum, or DG CVn for short, located about 60 light-years away. Both stars are dim red dwarfs with masses and sizes about one-third of our sun's. When stellar flares erupt they emit radiation across the electromagnetic spectrum, from radio waves to visible, ultraviolet and X-ray light. At 5:07 p.m. EDT on April 23, the rising tide of X-rays from DG CVn's initial blast triggered Swift’s detector. Scientists found the explosion was as much as 10,000 times more powerful than the largest solar flare ever recorded. Watch the video to learn more.
For More Information
See NASA.gov
Credits
Please give credit for this item to:
NASA's Goddard Space Flight Center
Cover image courtesy of NASA/GSFC/S. Wiessinger
DG CVn X-ray image courtesy of NASA/Swift
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Animators
- Scott Wiessinger (KBR Wyle Services, LLC) [Lead]
- Tom Bridgman (Global Science and Technology, Inc.)
- Walt Feimer (KBR Wyle Services, LLC)
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Writer
- Francis Reddy (University of Maryland College Park) [Lead]
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Video editor
- Scott Wiessinger (KBR Wyle Services, LLC)
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Interviewees
- Rachel Osten (STScI)
- Stephen Drake (USRA)
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Producer
- Scott Wiessinger (KBR Wyle Services, LLC)
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Narrator
- Scott Wiessinger (KBR Wyle Services, LLC)
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Videographers
- John Caldwell (Advocates in Manpower Management, Inc.)
- Rob Andreoli (Advocates in Manpower Management, Inc.)
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Project support
- Aaron E. Lepsch (ADNET Systems, Inc.)
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ID: 11531 Produced Video
Swift Catches Mega Flares from a Mini Star
Read moreOn April 23, NASA's Swift satellite detected the strongest, hottest, and longest-lasting sequence of stellar flares ever seen from a nearby red dwarf star. The initial blast from this record-setting series of explosions was as much as 10,000 times more powerful than the largest solar flare ever recorded. At its peak, the flare reached temperatures of 360 million degrees Fahrenheit (200 million Celsius), more than 12 times hotter than the center of the sun. The "superflare" came from one of the stars in a close binary system known as DG Canum Venaticorum, or DG CVn for short, located about 60 light-years away. Both stars are dim red dwarfs with masses and sizes about one-third of our sun's. They orbit each other at about three times Earth's average distance from the sun, which is too close for Swift to determine which star erupted. At 5:07 p.m. EDT on April 23, the rising tide of X-rays from DG CVn's superflare triggered Swift's Burst Alert Telescope (BAT). Swift turned to observe the source in greater detail with other instruments and, at the same time, notified astronomers around the globe that a powerful outburst was in progress.For about three minutes after the BAT trigger, the superflare's X-ray brightness was greater than the combined luminosity of both stars at all wavelengths under normal conditions.The largest solar explosions are classified as extraordinary, or X class, solar flares based on their X-ray emission. The biggest flare ever seen from the sun occurred in November 2003 and is rated as X 45. But if the flare on DG CVn were viewed from a planet the same distance as Earth is from the sun and measured the same way, it would have been ranked 10,000 times greater, at about X 100,000. How can a star just a third the size of the sun produce such a giant eruption? The key factor is its rapid spin, a crucial ingredient for amplifying magnetic fields. The flaring star in DG CVn rotates in under a day, about 30 or more times faster than our sun. The sun also rotated much faster in its youth and may well have produced superflares of its own, but, fortunately for us, it no longer appears capable of doing so. ||
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