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SOLAR SCIENCE
Coming Around Again: Giant Sunspot Makes Third Trip Across the Sun
by Staff Writers
Greenbelt MD (SPX) Mar 06, 2014


A giant sunspot appeared on Feb. 25, 2014, for its third trip across the face of the sun. This blend of two images from NASA's Solar Dynamics Observatory shows the sunspot in visible light and an X-class flare observable in ultraviolet light. Image courtesy NASA/SDO/Goddard Space Flight Center. For a larger version of this image please go here.

Scientists track sunspots that are part of active regions, which often produce large explosions on the sun such as solar flares and coronal mass ejections, or CMEs. Each time an active region appears it is assigned a number.

Active regions that have survived their trip around the back of the sun and reappear are assigned a new number - a convention left over from when we had no telescopes observing the far side of the sun and so could not be sure that the new sunspot was indeed the same as the old one.

This active region is currently labeled AR11990. Last time around it was labeled AR11967and its first time it was AR11944.

During its three trips thus far, this region has produced two significant solar flares, labeled as the strongest kind of flare, an X-class.

It has also produced numerous mid-level and smaller flares. While many sunspots do not last more than a couple of weeks, there have been sunspots known to be stable for many months at a time.

Studying what causes active regions to appear and disappear over time, as well as how long they remain stable, is key to understanding the origins of space weather that can impact Earth's technological infrastructure.

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Related Links
Solar Dynamics Observatory
Solar Science News at SpaceDaily






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SOLAR SCIENCE
Giant sunspot seen making third trek across surface of the sun
Greenbelt, Md. (UPI) Feb 28, 2013
A giant sunspot - a magnetically strong and complex region on the sun's surface - is making a third trip across the face of the sun, NASA reported Friday. Sunspots like the one being tracked by NASA scientists are part of active regions of the sun's surface that often produce large explosions such as solar flares and coronal mass ejections, the space agency said. Each time an a ... read more


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