File:NASA - Swift Catches Mega Flares from a Mini Star hL9OHXw -A8.webm
Original file (WebM audio/video file, VP9/Opus, length 4 min 1 s, 1,280 × 720 pixels, 938 kbps overall, file size: 26.99 MB)
Captions
Summary
[edit]DescriptionNASA - Swift Catches Mega Flares from a Mini Star hL9OHXw -A8.webm |
English: On 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. Read more at: http://www.nasa.gov/content/goddard/nasas-swift-mission-observes-mega-flares-from-a-mini-star/ This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/vis/a010000/a011500/a011531/ Like our videos? Subscribe to NASA's Goddard Shorts HD podcast: http://svs.gsfc.nasa.gov/vis/iTunes/f0004_index.html Or find NASA Goddard Space Flight Center on Facebook: http://www.facebook.com/NASA.GSFC Or find us on Twitter: https://twitter.com/NASAGoddard |
Date | |
Source | YouTube: NASA - Swift Catches Mega Flares from a Mini Star – View/save archived versions on archive.org and archive.today |
Author | NASA Goddard |
Licensing
[edit]Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
Warnings:
|
This file, which was originally posted to YouTube: NASA(archive), was reviewed on 20 November 2020 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.
The bot only checks for the license, human review is still required to check if the video is a derivative work, has freedom of panorama related issues and other copyright problems that might be present in the video. Visit licensing for more information. If you are a license reviewer, you can review this file by manually appending | |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 22:01, 19 November 2020 | 4 min 1 s, 1,280 × 720 (26.99 MB) | Eatcha (talk | contribs) | Uploaded NASA | Swift Catches Mega Flares from a Mini Star by NASA Goddard from Youtube |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
Transcode status
Update transcode statusMetadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Software used | Lavf58.29.100 |
---|