GCR 22 year periodicity
During S-N solar magnetic polarity orientation the peak GCR effective period is very short, perhaps a year or so
while during N-S orientation the effective period may be 4-5 years long, i.e. long enough to have an impact
on the global climate :

Temperatures' 22year periodicity from the Sun-GCR relationship

However, the strength of the Earth's magnetic field is the greatest obstacle to the GCR atmospheric penetration

Polar fields intensity changes at different rates, the magnetic dipole strength is given as an average of two
(link to data is http://www.vukcevic.co.uk/GMF-data.htm  is here)

Thus, finally we have:


More charts can be found here: Graphs and Formulae

© m.a. vukcevic