[amsat-bb] Re: Could we raise orbit thru magnetorque?
James C. Mankin
n5x at psu.edu
Wed Feb 21 16:25:11 PST 2007
Here is a link I found to using current carrying tethers for changing
n5x at psu.edu
Marc Vermeersch wrote:
> Hi Jim,
> Is this the same principle? I believe this has to do with the gravitational
> field not the magnetic field.
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of James C. Mankin
> Sent: Wednesday, February 21, 2007 7:16 PM
> To: Bruce Bostwick
> Cc: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: Could we raise orbit thru magnetorque?
> I seem to remember back when they were testing tethered satellites from
> the Shuttle that one of
> the possible applications being discussed was that if you could deploy
> enough wire and put the
> right current through it that it was possible to change orbits. I dont
> see why it wouldnt work if
> a large loop of wire could be created say between three satellites in a
> Jim Mankin
> n5x at psu.edu
> Bruce Bostwick wrote:
>> That's been my understanding as well. Magnetorquing by itself can
>> drive rotation but not translation. Its main benefit is that it
>> saves propellant, weight, and complexity, as well as moving parts and
>> the risk of a hypergolic plumbing assembly exploding and taking out
>> half the spacecraft's systems, by allowing the spacecraft to handle
>> rotation with more reliable torquing coils and get its energy for
>> that from the PV panels. Changing orbits still requires firing a
>> reaction thruster of some sort.
>> On Feb 20, 2007, at 9:47 AM, John Mock KD6PAG wrote:
>>>> 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 ?.
>>> I believe magnetorquing can only change the orientation of a
>>> satellite and
>>> not its orbit. It is certainly used in the process of changing an
>>> in order to get a thrusting device pointing in a direction where it
>>> do something useful. But by itself, it can't change an orbit. It
>>> can help
>>> point antennas in the proper direction, etc.
>>> -- KD6PAG (Networking Old-Timer, Satellite QRPer)
>> "People don't like to be meddled with. We tell them what to do, what
>> to think, don't run, don't walk. We're in their homes and in their
>> heads and we haven't the right. We're meddlesome." -- River Tam,
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