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Thanks for the imput, I hope all on this thread can appreciate your post. Some of it I know about, much of the rest I am just on the periphery, and much of what we hear of is just spin....
NASA:
...The Nile water levels and aurora records had two somewhat regularly occurring variations in common - one with a period of about 88 years and the second with a period of about 200 years....
www.jpl.nasa.gov...
Introduction
It has long been theorized that the Earth's rate of rotation has been slowly decreasing through time. However, only recently have apparent accelerations been discovered....
Abstract- Variations in the rate of Earth rotation have been correlated with the non-dipole portion of the Earth's geomagnetic field.
Long period variations have been correlated to geomagnetic polarity bias, and short period variations have been attributed to non-dipole induced electromagnetic coupling between the outer core and the lower mantle. It is believed that the polarity bias is a manifestation of core-mantle boundary topography influencing the otherwise random behavior of the non-dipole portion of the field. Mass transfer at the core-mantle boundary due to topographic changes (perhaps due to oceanic trench redistribution) may result in the required changes in the Earth's angular velocity, due to conservation of angular momentum. On a shorter time scale, electromagnetic coupling may produce a sufficient torque on the lower mantle to affect drag. Short period fluctuations of rotation correlate well with mean global temperature variations. It is proposed that circulation in the core, mantle, lithosphere, and atmosphere are interrelated.
www.natsci.colostate.edu...