Solar eye candy: close-up movie shows a giant eruption rising and twisting from the Sun’s surface

By Tom Yulsman | August 27, 2018 11:56 am
solar prominence

NASA’s Solar Dynamics Observatory spacecraft captured this animation of a solar prominence on August 13, 2018. (Source: NASA)

In my ongoing hunt for cool imagery to feature here at ImaGeo, I regularly check to see what NASA’s Solar Dynamics Observatory spacecraft has been seeing on the Sun. The animation above is one of SDO’s more recent captures.

It shows an eruption of material rising up along invisible magnetic field lines, twisting, and then falling back down, all over a course of two hours on August 13. The feature is known as a solar prominence.


A representation of a 3D model of magnetic fields inside a solar prominence. (Source: NASA)

A solar prominence occurs when two points on the Sun’s photosphere — essentially its surface — inject plasma along magnetic field lines. (Plasma is the fourth state of matter. Read more about it here.)

As the plasma rises up from those points, it interacts with the magnetic field lines, resulting in the twisting and turning motions. In this case, the feature collapsed back to the Sun’s surface. But sometimes, the structure can become unstable and burst, propelling the plasma outward in a giant explosion. When that happens, the phenomenon is known as an eruptive prominence.

Speaking of giant, in the animation above, the Earth would easily fit within the twisting loop of hot plasma. And this prominence was actually pretty minor.

solar prominence

A solar prominence as seen in extreme UV light, with Earth superimposed for a sense of scale. (Source: NASA/SDO)

Here’s an example of a much bigger prominence — an eruptive one. It was seen by SDO on March 30, 2010.

solar prominence

Source: NASA/SDO

The Solar Dynamics Observatory observes solar prominences in extreme ultraviolet light. When viewed erupting from the limb of the Sun — the apparent edge of the Sun — they appear bright against the almost black background of space.

But as it turns out, the plasma in a prominence is much cooler than the surface of the Sun. So when a prominence is viewed against the hotter solar surface, it will appear much darker. The result is a dark, snaking, filament-like structure. Click on the thumbnail image to see what that looks like.

Solar activity has been falling as part of a natural cycle. Roughly a year from now, activity should begin to rise, beginning the next 11-year solar cycle. Activity will rise to a peak and then fall once again.

Scientists forecast that the next solar cycle could be about 25 percent smaller than the one we’re finishing now.

CATEGORIZED UNDER: Astronomy, select, Sun, Top Posts


ImaGeo is a visual blog focusing on the intersection of imagery, imagination and Earth. It focuses on spectacular visuals related to the science of our planet, with an emphasis (although not an exclusive one) on the unfolding Anthropocene Epoch.

About Tom Yulsman

Tom Yulsman is Director of the Center for Environmental Journalism and a Professor of Journalism at the University of Colorado, Boulder. He also continues to work as a science and environmental journalist with more than 30 years of experience producing content for major publications. His work has appeared in the New York Times, Washington Post, Audubon, Climate Central, Columbia Journalism Review, Discover, Nieman Reports, and many other publications. He has held a variety of editorial positions over the years, including a stint as editor-in-chief of Earth magazine. Yulsman has written one book: Origins: the Quest for Our Cosmic Roots, published by the Institute of Physics in 2003.


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