My Research and observations into the progression of F10.7cm solar flux have resulted in the following conclusions.
1-Cycle minimum of October 1964 the 10.7cm flux took 21 months to get above 100.(add decimal point in graph). 106.7 july 1966.
high solar flux then lasted 83 months =6.9yrs to may 1973.
2.-June 1973-November 1977 low solar Flux. 53 months =4.4yrs.
3- December 1977-June 1984 High solar flux. 70 months = 5.8yrs.
4. July 1984 – Jan 1988 Low solar Flux
41months = 3.4yrs.
5-Feb 1988 – June 1993 High solar Flux
64 months = 5.3yrs.
6-July 1993 – March 1998 Low solar Flux 58months. = 4.8yrs
7-April 1998 – November 2004 High solar Flux 89 months. = 7.4yrs.
8-December 2004 – March 2011 Low solar Flux
70 months = 5.8yrs.
9- April 2011 – February 2016 High solar flux
58months = 4.8yrs.
10- March 2016 – Current low solar flux, = 21 months this on trend will continue for at least the next 35/40 months or 2.9/3.3yrs. = Sept 2020/ March 2021. excluding intermittent short F10.7 months as in September 2017 x-class Flares.
The Overall conclusion is that F10.7cm Flux has a negative trend in time scale from April 1998 when the highest period length of F10.7 lasted 7.4 years.
F10.7 flux is our guide to energy emitted from the Sun, this negative trend suggests a deep Minimum in the coming decades with trending long term low 10.7cm flux.
This will result in a reduction of Solar Irradiance and an overall downward trend in Temperatures; as we are already seeing from the Teleconnections during 2016/17 in the Northern Hemisphere.