The Sun-spot Group, NOAA 12177 On 02 Oct 2014, Color Version.
Taken by Gabriel Corban on October 2, 2014 @ Bucharest, Romania
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Here is my processing of a raw file, credit Big Bear Solar Observatory, USA, operated by the New Jersey Institute of Technology.This image is a H-alpha line center image taken of NOAA 12177 on 02 Oct 2014. The image is a speckle reconstruction based on 25 images selected from a burst of 50 at an exposure time of 20 ms. The filter is a Fabry-Perot with a bandpass of 0.08A and the camera is a PCOedge 2kx2k.
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