[amsat-bb] Re: Could we raise orbit thru magnetorque?

Marc Vermeersch amvm at skynet.be
Tue Feb 20 06:20:25 PST 2007

Hi Pedro,

Interesting thought!! A few remarks around this:

- AFAIK magnetorque-ing is being used to change orientation but not for
changing orbit. I wonder what would happen in your scenario: I kind of
expect the satellite to change orientation because of the impossibility of
exactly opposing the poles.

- I assume that magnetorque-ing is achieved by sending a current through a
coil. The force on a conductor in a magnetic field is:
	Force = current [A] x length [m] x magnetic field [Tesla]
The magnetic field of Mother Earth is about 0.00005 Tesla at the surface so
a fraction of that at satellite altitude. Generating usable force looks like
a challenge.

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of lu7abf
Sent: Monday, February 19, 2007 4:48 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Could we raise orbit thru magnetorque?

In thinking on a future satellite project, this question was made.

Argument is:  if when satellite is in the north, a north magnetic field is
applied on z plane, will satellite raise orbit ? Same but opposite on south.
Considering limited energy available could this raise be significant if
applied on all orbits ?. 

Tks for any answer or argument.

lu7abf, Pedro Converso
lu7abf at amsat.org.ar
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