Both are seen in extreme ultraviolet light, and both show solar activity for one month.
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Last month, the sun's surface was animated by many bright areas, with loops arcing above them.
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Lastly, here's a graph tracking the progress of the sun's 11-year cycle from the Space Weather Prediction Center:
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It should come by the end of this year, or early next.
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By comparison, not much was going on back in 2010.
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The side-by-side photos from NASA's Solar Dynamics Observatory show just what a difference a couple of years can make.
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The photo on the left is from October, 2010, when activity was very low; the one on the right is from just last month.
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The SDO Facebook page features regular updates on solar activity, sometimes before they appear on the regular NASA SDO website.
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This is a screenshot, so please find out and watch the related videos, which run simultaneously in the same frame.
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As the graph shows, we're getting close to the time predicted for the peak in solar activity.
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Since bottoming out in 2009 as part of an 11-year cycle, activity on the sun has been heading for a peak.
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