B.1 Historical dates of solar maximum and minimum

The dates of the commencement of solar minimum and solar maximum are provided in Table B-1 based on data from NOAA/SEC [RN.27]:

For use with the trapped radiation belt models specified in 9.2.1.1 and for solar particle models, a period of solar maximum activity is considered to be starting 2,5 years before the year of maximum sunspot number and ending 4,5 years after the period of solar maximum. For solar cycles beyond cycle 23, the year of solar maximum for cycle i is estimated by the following formula:

(B‑1)