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Tracking a Gigantic Sunspot Across the Sun
October 31, 2014

Update: Nov. 4, 2014




An active region on the sun – an area of intense and complex magnetic fields – rotated into view on Oct. 18, 2014. Labeled AR 12192, it soon grew into the largest such region in 24 years, and fired off 10 sizable solar flares as it traversed across the face of the sun. The region was so large it could be seen without a telescope for those looking at the sun with eclipse glasses, as many did during a partial eclipse of the sun on Oct. 23.

"Despite all the flares, this region did not produce any significant coronal mass ejections," said Alex Young a solar scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Coronal mass ejections, or CMEs, are giant clouds of solar particles that can affect technology when they reach near-Earth space. "You certainly can have flares without CMEs and vice versa, but most big flares do have CMEs. So we're learning that a big active region doesn't always equal the biggest events."

Such active regions are measured in millionths of a solar hemisphere, where 1 micro-hemisphere, or MH, is about 600,000 square miles. This region topped out at 2,750 MH, making it the 33rd largest region out of approximately 32,000 active regions that have been tracked and measured since 1874. It is the largest sunspot seen since AR 6368, which measured 3,080 MH on Nov. 18, 1990.

The largest five active regions ever observed were between 4,000 and more than 6,000 MH and they all appeared between 1946 and 1951.

On the other hand, the region that produced one of the biggest solar flares of all time on Sep. 1, 1859  – in what's known as the Carrington event – wasn't even one of the top 50 at only 2,300 MH.

During its trip across the front of the sun, AR 12192 produced six X-class flares, which are the largest flares, and four strong M-class flares. M-class flares are one tenth as strong as X-class flares. The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.

"Having so many similar flares from the same active region will be a nice case study for people who work on predicting solar flares," said Dean Pesnell, project scientist for NASA's Solar Dynamics Observatory at Goddard. "This is important for one day improving the nation's ability to forecast space weather and protect technology and astronauts in space."

The dates and peak times in EDT of the large solar flares from AR 12192 are as follows:

Oct. 19, 1:01 am:      X1.1

Oct. 21, 9:59 pm:      M8.7

Oct. 22, 10:28 am:    X1.6

Oct. 24, 5:41 pm:      X3.1

Oct. 25, 1:08 pm:      X1.0

Oct. 26, 6:56 am:      X2.0

Oct. 26, 8:34 pm:      M7.1

Oct. 27, 6:09 am:      M6.7

Oct. 27, 10:47 am:    X2.0

Oct. 28, 11:32 pm:    M6.6

AR 12192 rotated onto the far side of the sun on Oct. 30, 2014, however as it evolves, we may see a new version of it rotating back into view in two weeks.

Related Links:

For more on this gigantic sunspot and its flares:
  > http://www.nasa.gov/content/goddard/sdo-observes-largest-sunspot-of-the-solar-cycle/
  > http://www.nasa.gov/content/goddard/sdo-observes-more-flares-erupting-from-giant-sunspot/
  > http://www.nasa.gov/content/goddard/one-giant-sunspot-6-substantial-flares/
  > http://www.nasa.gov/content/goddard/oct-22-2014-third-substantial-solar-flare-in-2-days/
  > http://www.nasa.gov/content/goddard/sdo-observes-an-x-class-solar-flare/

   > Sunspot AR2192 Flare Family Portrait

   > Sunspot AR2192 Flare Family Portrait - Unlabeled 

  > Download high resolution media from Oct. 24, 2014

  > Download high resolution media from Oct. 22, 2014

  > What does it take to be X-class?

  > View Past Solar Activity

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This movie shows eight days – Oct. 19-27, 2014 — in the life of the largest active region seen on the sun since 1990, including five X-class flares that erupted during that time.
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The largest sunspot since November 1990 is seen traveling across the front of the sun in these images from NASA's SDO, captured Oct. 17-Oct 29, 2014.
The largest sunspot since November 1990 is seen traveling across the front of the sun in these images from NASA's SDO, captured Oct. 17-Oct 29, 2014.
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This movie shows fireworks on the sun as 10 significant flares erupted on the sun from Oct. 19-28, 2014. The graph shows X-ray output from the sun as measured by NOAA’s GOES spacecraft. The X-rays peak in sync with each flare.
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Sunspot AR2192 produced 10 significant flare while traversing the sun's face.
Super sunspot AR2192 produced 10 significant solar flare while traversing the Earth-side of the sun; six X-class and four above M5-class.
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Page Last Updated: November 13th, 2014
Page Editor: Holly Zell