Re: Threading a moon

On Oct 30, 6:41 pm, Logan Kearsley <chronosur...@xxxxxxxxx> wrote:
On Oct 30, 7:07 am, IsaacKuo <mech...@xxxxxxxxx> wrote:

First off, whether the drag is inward or outward depends
on how fast the planet is spinning, not the magnetic field
(although obviously these may be related). The planet's
rotation rotates the surrounding plasma field along with
it (it's essentially really really upper atmosphere).

Wah? What matters is the relative velocity between the conductor and
the local magnetic field lines, which depends on how fast the magnetic
field is rotating.

No, in fact the relevant effect works just fine if the magnetic
field isn't rotating at all.

Essentially, you're using the exact same effect as an
MHD generator. There's a more or less constant
magnetic field. You have a couple electrodes as well
as plasma flowing past those electrodes. In this case,
the electrodes are the non-insulated ends of the tether.
The flowing plasma is the really thin exosphere of
the planet.

Lorentz force acts on the electrons in the plasma as
well as the electrons in the tether. Because they're
not moving at the same speed, the Lorentz force acts
differentially--and a current results.

The direction of this current depends on whether
the plasma is moving faster or the tether is moving
faster. In turn, this determines the direction of the
drag force. Essentially, the plasma will try to drag
the tether to its velocity and vice versa.

Isaac Kuo

.

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