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November 2014: NOAA 12192, the largest active region of solar cycle 24?

NOAA 12192 is the identification number of one of the largest regions of strong magnetic activity seen in the current solar cycle 24, which started back in January 2008. The NOAA 12192 active region appeared on the solar disc on 17 October 2014, harbouring several large sunspots visible even to the naked eye. The size of the active region was gigantic, with an area extending over 2750 millionths of the visible solar hemisphere (MHS). The largest umbral diameter reached up to 22000 km, almost twice as big as the diameter of Earth. By 27 October 2014, NOAA 12192 ranked 33rd in the list of...(Read more)

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