Solar Cycle 24 May 15 Update–Belated

Updating Solar Cycle 24 May 2015 status indicates that despite an uptick in Sunspots, the trend is still moving away from the maximum to quieter times.


The May International Sunspot number was 58.8 versus April’s number of 54.4. (Click on charts to enlarge.)


The F10.7cm solar flux number, perhaps the best indicator of solar activity, can be seen on this chart:

solar-cycle-10-cm-radio-fluxMAY15NOAAThe F10.7cm is comparable to the Sunspots chart in magnitude and direction.

The following chart shows data through the 14th of June.  Cycle 24 is still a long way from minimum (estimated to be in 2019 by NASA, although my guess is it will be at least a year more) and that can be seen by the NOAA Sunspot number that shot up about one week into the month of June.


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