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Sun's Loops are Displaying an Optical Illusion

Wednesday, July 10, 2013 1:46

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(Phys.org) —The Sun’s outer atmosphere, or corona, has posed an enduring mystery. Why is it so hot?

The Sun’s visible surface is only 10,000 degrees Fahrenheit, but as you move outward the temperature shoots up to millions of degrees. It’s like a campfire that feels hotter the farther away you stand.

To understand how the corona is heated, some astronomers study coronal loops. These structures are shaped like an upside-down U and show where magnetic field lines are funneling solar gases or plasma.

Follow the link to watch the video: Plasma at Roughly 8,000 – 20,000 Degrees C Above the Surface of the Sun

https://www.youtube.com/watch?v=l1pwnqQ_Iuw

This photo of the sun’s edge, taken with the Solar Dynamics Observatory Atmospheric Imaging Assembly, shows coronal loops in a variety of sizes. Although the loops appear to have a constant width, like strands of rope, new work suggests that this is an optical illusion. The loops are actually tapered, wider at the top and narrower at the bottom. Credit: NASA/SDO

Our best photos of the Sun suggest that these loops are a constant width, like strands of rope. However, new work shows that this is an optical illusion; the loops are actually tapered, wider at the top and narrower at the ends.

This finding has important implications for coronal heating.

Provided by Harvard-Smithsonian Center for Astrophysics

physorg.com

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