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The solar plasma and magnetic field of the sun are too weak for interplanetary voyages. Most of the planets do not have the right conditions for propulsive tether operations. Even Jupiter, with its intense magnetic field, does not have the right gravity gradient to keep a tether strung out to help move a satellite in exploring its moons.
Originally posted by JimOberg
What date/time should we look up on that list?
Originally posted by poet1b the glow of the tether is from the plasma, and that is probably increased by solar plasma while in direct sunlight.
While this may occur for any type of insulator, it is of perhaps greatest interest in the case of anodized aluminum, the main ISS structural element, and a material used in astronaut EMUs (spacesuits). Because the dielectric layer in anodized aluminum is typically very thin (0.1-1 mil) it can break down at potentials of 100 V or less, less than the floating potential that is possible for a 160 V array. It was the arcing threat from the ISS anodized aluminum that forced ISS to incorporate the PCUs to control ISS floating potentials. The PCUs act by creating a large localized plasma cloud that makes good electrical contact with the surrounding plasma, and essentially by brute force grounds the ISS structure to the ambient plasma. A generic plasma-contacting device is called a plasma contactor.
Different samples of anodized material breakdown at different potentials in a plasma (see Hillard et al, 2000). While ISS sulfuric acid anodize withstands about 200 V before breaking down, the chromic acid anodize was found in ground tests to break down at about 72 V. Most disturbing of all, chromic acid anodized samples for astronaut EMUs were found to break down at potentials of only 60 V, relative to the plasma, with a two-sigma error bar of 10 V. It is thus possible that an astronaut, grounded to ISS by his tether or conductive tools, could undergo an arc at only 50 V. A sneak circuit analysis showed that such arcs could put 1 Amp of current through an astronauts heart. Since 0.1 Amp is enough to cause heart stoppage, it is imperative that if the ISS plasma contactors are inoperable during astronaut EVAs, a method be used to prevent ISS astronaut workplaces from floating more than 50 V negative.
Originally posted by zorgon
Moths to a flame look a lot like what we see in the tether video
Originally posted by ArMaP
That light is so bright, could it be a plasma light?
Originally posted by zorgon
Plasma clouds (sheaths) and plasma arcing are a very big deal in space. And don't forget that all this collecting of the electrons from the plasma is the exact same as harnessing a lightning bolt... FREE UNLIMITED ENERGY just by dragging a copper wire through the Earth' ionosphere at speeds above 17,000 mph. That is after all the point of the tether... to eliminate the need of rocket fuel.
Originally posted by JimOberg
There's no 'free energy' from tethers, any more than there's free energy from a rotating wire in a magnetic field.
Originally posted by JimOberg
However, other effluent releases can last for many minutes -- eg, water dumps,
Originally posted by zorgon
Yet what they are thinking is getting rid of the meter.
They forget the consequences of all the jobs that would wipe out so they don't have to pay.
Originally posted by ArMaP
reply to post by zorgon
Without knowing anything about that photo it's a little hard to tell, but my best bet, at the moment, is a long exposure of some moving object.
Originally posted by poet1b
Of all the characteristics Astronauts need in order to be accepted by the space program, keeping their mouths shut about what they see, and leaving all revelation of observations up the control of upper muckity mucks is probably the most important,