Solar activity during the summer of 2016

(close the minimum of the cycle 24)

The following sun images have been taken exactly the same day, approximately at the same time, with optics having nearly the same diameter. The first image is showing the sun through a standard filter of density 5, also called white-light solar filter. The second image has been obtained with a Hα filter, selecting only the wavelength emitted by the hydrogen at 656.29nm.

 · Sun images taken on July 16, 2016, @ 16:08 UTC (white light) and @ 12:56 UTC (Hα)

© Michel Willemin

 · Sun image taken on September 10, 2016, @ 13:43 UTC (white light)

© Michel Willemin

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