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Submitted on 2012-07-20
The graph underneath could have been the profile of a mountain stage in the Tour de France, but no: it shows the evolution of the x-ray flux as it was observed by the GOES-15 satellite from 17 till 19 July 2012.
Submitted on 2012-07-14In the afternoon of July 12, 2012, the complex and up-to-then relatively quiet sunspot group NOAA 1520 all of a sudden produced an extreme solar flare.
Submitted on 2012-07-10As noted in a previous comment, NOAA 1515 produced 5 high energetic events during its transit. The last of these events was an M6.9-flare on July 8th that occurred while NOAA 1515 was already close to the western solar limb. The flare started at 16:23UT and reached its maximum x-ray intensity at 16:32UT. The images underneath show the eruption as seen by PROBA2/SWAP and in H-alpha during the flare's peak and at 16:54UT. One can clearly see that material is ejected from the blast site.
Submitted on 2012-07-06NOAA 1515 appeared at the southeastern solar limb on June 27th. With a maximum sunspot area of only about 5 times the total surface of the Earth, it certainly did not become the biggest sunspot group so far this solar cycle.
Nonetheless, the group was quite complex and showed interesting dynamics. For example, the images underneath taken by SDO/HMI on 1 and 2 July show the splitting of the main spot in less than 24 hours! Cytokinesis of solar proportions!
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