Skip to content

Current Solar Cycle Quietest In Almost 200 Years

Frank Bosse and Fritz Vahrenholt, No Tricks Zone

Last month our sun gave a really sluggish impression. The sunspot number (SSN) was only 38.4: only 46% of what is normal at this time into a cycle for all the cycles observed since 1750.

Fig. 1: The current solar cycle 24 compared to the mean of all previous cycles (blue) and to solar cycle no. 1, 1755-1766, (black).

Comparing the individual cycles to each other further confirms that the current cycle is a quiet one compared to those we saw in the second half of the last century:

Fig. 2: Comparison of all the solar cycles. The figures represent the summed SSN deviation from the mean for first 76 months into the cycle, for all cycles. The current cycle so far is the 4th most inactive since observations began in 1750.

The current cycle is the quietest since solar cycle no. 7, which occurred around 1830.

Full post