Re: Earth's Magnetic Field

[Chuck Britton <britton@ODIE.NCSSM.EDU>]

VERY recent seismographic measurements show that the solid core has a
slightly different angular velocity than does the liquid core. (I
forget whether the solid velocity is presently greater or less than
that of the liquid)

When the earth's B field is reversed, the relative motions will be different.

The sun reverses its field every 11 years and the picture that is
often presented is the HPG with spontaneous, chaotic reversals.
Tangling, twisting of the flux tubes etc. (at least that's the way
Faraday would call his 'elastic' flux lines into play, winding and
unwinding as the two masses 'rock back and forth')

> But I still have a problem even with that explanation. David states that the
> Earth's fluid outer core is almost certainly in motion. In what frame of
> reference is this motion? With respect to the solid inner core? The solid
> surface? The CM of the Earth-Moon system? In using the sun's small magnetic
> field at the Earth to power the Earth's interior dynamo, David
> implies that the fluid core's motion is with respect to the sun.
> Well, is this "third
> requirement" motion (relative motion of the fluid core in the sun's magnetic
> field) due to the Earth's rotational motion, it's revolutionary motion, the
> vector sum of both, or some other?
>
> poj

  -.     .-.     .-.     .-.     .-.     .-.     .-.     .-.     .-.     .-
    \   /   \   /   \ N /   \ C /   \ S /   \ S /   \ M /   \   /   \   /
     `-'     `-'     `-'     `-'     `-'     `-'     `-'     `-'     `-'
Chuck Britton                                   Education is what is left when
britton@odie.ncssm.edu                          you have forgotten everything
North Carolina School of Science & Math         you learned in school.
(919) 286-3366  x224                            Albert Einstein,        1936