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| Current Solar Data from NOAA (HERE + HERE) |
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| The number of sunspots in existence at any one time is continually subject to change as some disappear and new ones emerge. As the sun rotates on its own axis, these sunspots are visible at 27-day intervals, the approximate period required for the sun to make one complete rotation. The 27-day sunspot cycle causes variations in the ionization density of the layers on a day-to-day basis. |