D. Djurovic et P. Paquet, THE COMMON OSCILLATIONS OF SOLAR-ACTIVITY, THE GEOMAGNETIC-FIELD, ANDTHE EARTHS ROTATION, Solar physics, 167(1-2), 1996, pp. 427-439
An oscillation with a period around 5.5 years is identified as being c
ommon to the geomagnetic field, the Earth's rotation, and solar activi
ty variations. The large extrema of the cross-correlation functions an
d their oscillatory character are considered to be indicators of a phy
sical relation between geophysical and solar phenomena.