Re: Solar rotation period

In message <1138214400.235510.325780@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, oriel36 <geraldkelleher@xxxxxxxxx> writes 
There is too much intellectual atrophy at present and even though I
came up with the link between diffferential rotation between Equatorial
and polar regions as the mechanism for the Earth's deviation from a
perfect sphere about its axis and subsequently the motion of the
component plates that profile the Earth's shape,I have intentionally
left it for participants to pick up on.

But there is no differential rotation. Obviously, there can't be for the solid surface, but AFAIK there is no evidence of differential rotation for any part of the liquid core. The polar regions rotate with the same period as the equator. Unless you know differently. There's a slight difference between the core and mantle, but that's all.


No use sticking with convection cells as a mechanism for crustal motion
as that sloppy mechanism has no link with the Earth's interior dynamics
in the molten mantle in generating the Equatorial bulge.


Has anyone ever suggested that it does?


No use sticking with the Newtonian explanation for there is nothing to
make it deviate from a perfect sphere,using the Sun's plasma as a
guide,it should be obvious enough that the differential between the
Earth's mantle rotating at 1000 miles an hour at the Equator and
diminishing to 0 at the poles would generate a differential that is not
as dramatic as it would first appear but enough to cause the 46 km
difference across the pole to Equator.

That's not what differential rotation means. If you think current theory is wrong, do the math and show me. Note that Newton's assumption of a homogeneous earth is now known to be wrong, so it's not surprising that his figure isn't accurate.


Look at the Sun's  surface in rotation and it is difficult  to imagine
how the Earth's shape could be otherwise.
To answer Axel's question a solid rotating shell would not display a
deviation from a perfect sphere,anything less will and I know that Axel
is one of the few men good enough to affirm this.


But over geological times and on geological scales the earth behaves as though it's in hydrostatic equilibrium, not solid. So does the sun, but the sun's gravity combine with slow rotation to enormously outweigh the "centrifugal force" that would otherwise produce an oblate spheroid. So the sun is an almost perfect sphere. If you want examples of stars that aren't, look up Altair or Achernar.
OTOH, the sun does undergo differential rotation, so the polar regions don't just rotate more slowly but with a slower period. Michael Mozina's claims to the contrary just don't add up, and they are contradicted by peer reviewed papers using SOHO satellite data to show that differential rotation doesn't just occur at the surface but at various depths, as in the link I posted.
.

Relevant Pages

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