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Scientists Discover Structure Within the Sun’s Corona

via Engadget

The answer lies in the outer corona of the Sun, where the solar wind originates. If the Sun causes the turbulence, then the outer corona itself should have some structure. Up until now, when scientists studied the outer corona, it appeared smooth and homogenous. The team used long-exposure images from the spacecraft STEREO-A that blocked out the star itself to look at this area. The problem was increasing the resolution of cameras that were already flying in space and couldn’t be serviced.

The answer: Use algorithms in order to process the images in various ways to enhance the clarity. By filtering out the noise from background stars, correcting for how long the shutter was open during image capture and normalizing brightness, the team was able to reduce the signal-to-noise ratio and produce clearer and crisper images. Additionally, the team ran an algorithm to reduce motion blur in real-time. They accomplished this by actually shifting their images to take the motion of the solar wind into account. “We smoothed, not just in space, not just in time, but in a moving coordinate system,” DeForest said. “That allowed us to create motion blur that was determined not by the speed of the wind, but by how rapidly the features changed in the wind.”

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