The Sharpest View of the Sun
© SST, Royal Swedish Academy of Sciences
The filaments' newly revealed dark cores are seen to be thousands of miles long but only about 60 miles wide. Resolving features 60 miles wide or less is a milestone in solar astronomy and has been achieved here using sophisticated adaptive optics, digital image stacking, and processing techniques to counter the blurring effect of Earth's atmosphere.
At optical wavelengths, these images are sharper than even current space-based solar observatories can produce.