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Coronal loops

View larger. | Coronal loops October 26-29, 2014
View larger. | This image of coronal loops on the sun – October 26-29, 2014 – combines two wavelengths of extreme ultraviolet light. Image via NASA/Solar Dynamics Observatory

The biggest sunspot region in more than two decades put on quite a show for sun-watchers in late October, 2014. This huge sunspot – called AR 12192 (aka AR 2192) – was around 129,000 kilometers across, or big enough for 10 Earths to sit side-by-side along its diameter! It produced many solar flares, including several X flares, the largest kind. By October 26, for example, this part of the sun had erupted with its sixth substantial flare in about a week’s time.

But the show wasn’t over yet. As AR 12192 rotated over to the edge of the sun, just before it disappeared to the back of the sun as seen from Earth, it put on a wonderful display of coronal loops.

These beautiful loops are found around sunspots and in active regions. They are associated with the closed magnetic field lines that connect magnetic regions on the solar surface. Energetic particles spinning along magnetic field lines make visible to us.

Sunspot region AR 12192 on various dates. Image via NASA/SDO
Sunspot region AR 12192 – aka AR 2192 – on various dates. Image via NASA/SDO
November 8, 2014
Today's Image

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