-Caveat Lector- --- donna <[EMAIL PROTECTED]> wrote: > To: "RadarMatrix2003" > <[EMAIL PROTECTED]> > From: "donna" <[EMAIL PROTECTED]> > Date: Thu, 10 Jul 2003 13:33:59 -0400 > Subject: [RadarMatrix2003] Earth's ionosphere is a > vast, unbounded laboratory > > Im no Rocket scientist, but I imagine Star wars to > have something to do with this tether system. > > > http://liftoff.msfc.nasa.gov/Shuttle/sts-75/tss-1r/brochure/page_i.html > Scientists study plasma for practical purposes. In > an effort to harness fusion energy on Earth, > physicists are studying devices that create and > confine very hot plasmas in magnetic fields. > > The TSS-1R investigators will study the > electrodynamic properties of a tethered satellite > system and its interaction with Earth's ionospheric > environment of charged gas (plasma) and magnetic and > electric fields. The motion of the Tethered > Satellite System through Earth's magnetic field > generates a voltage across the conductive tether. As > a result, the TSS is able to extract an electrical > current from the ionospheric plasma at the satellite > and to emit that current by means of electron > accelerators in the payload bay. Investigators will > be able to vary this current and control the > electrical potential of the satellite to create and > study a variety of phenomena and processes. These > include electric power generation, wave generation > and propagation, neutral gas ionization, and basic > physical processes that occur naturally in plasmas > surrounding Earth and other planets, moons, and > comets. Although some of these phenomena have been > studied in laboratories, the ground-based scientist > is limited to experimenting on a small scale and is > hampered by chamber wall effects, unnatural plasma > distributions, and other problems. > For the Tethered Satellite System, Earth's > ionosphere is a vast, unbounded laboratory for space > plasma experiments that can be conducted in no other > way. > A tether system could supply power to an orbiting > spacecraft, supplementing solar arrays and batteries > or serving as a backup emergency power system. The > longer the tether, the higher the electrical voltage > it will produce. The 20.7-km long tether used in the > TSS-1R mission will generate up to approximately > 5,000 volts, while a 96-km long tether could > generate as much as 15,000 volts. The total amount > of power produced by the system will depend on orbit > inclination, conditions in the ionosphere, and the > capabilities of the satellite to collect electrons. > One of the questions TSS-1R may help to answer is > how much current can be extracted from the > ionosphere. > > > > the current is carried away from the tethered system > through the ionosphere by electromagnetic waves. > > > > > The TSS-1R tether will be the longest antenna ever > placed in orbit. It can be used either passively for > receiving radio waves from other sources or actively > as a transmitting antenna. To transmit, the current > passing through the tether may be modulated by > pulsing it on and off at the required frequency. The > longer the tether, the lower the frequency at which > it can radiate waves efficiently. This unique > ability to produce low-frequency waves makes a > number of active experiments possible. For example, > since very-low-frequency radio waves can penetrate > deeper into sea water than normal radio > transmissions, they may be used to communicate with > submerged vehicles. >
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