May 21, 2012 | 4
This time-lapse video of Sunday’s solar eclipse highlights the Sun’s outer layers:
The photographer Cory Poole constructed the video by pasting together 700 photographs taken with a Coronado Solar Max 60 Double Stack telescope. According to Jason Kottke, Poole used a filter that only allows light from hydrogen atoms moving from the 2nd excited state to the 1st excited state. This allows Poole to highlight the chromosphere, the Sun’s lower atmosphere.
Secrets of the Universe: Past, Present, FutureX