From: Phase space representation of neutron monitor count rate and atmospheric electric field in relation to solar activity in cycles 21 and 22
Resampling time (years)
SSA–NC
SSA–PG
NC–PG
r (p value)
1
0.8260 (~0.0002)
0.693 (~0.006)
0.61 (~0.02)
2
0.83 (~0.02)
0.7 (~0.1)
0.6 (~0.1)
3
0.6 (~0.3)
0.5 (~0.4)
4
0.9 (~0.1)
0.6 (~0.4)
0.7 (~0.3)