Effects of space plasma discharge on the performance of large antenna structures in low Earth orbit

Details Effects of space plasma discharge on the performance of large antenna structures in low Earth orbit Effects of space plasma discharge on the performance of large antenna structures in low Earth orbit

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8720339b&link_type=abstract

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Computer Science

Performance

Antenna Radiation Patterns, Earth Orbital Environments, Electromagnetic Interference, Large Space Structures, Plasma Jets, Space Plasmas, Charged Particles, Coma, Comets, Hoop Column Antennas, Mesh, Oxygen

Scientific paper

The anomalous plasma around spacecrafts in low Earth orbit represents the coma of an artificial comet. The plasma discharge is caused by an energetic disturbance of charged particles which were formerly in a state of equilibrium. The plasma can effect the passive and active radio frequency operation of large space antennas by inducing corona discharge or strong arcing in the antenna feeds. One such large space antenna is the 15-meter hoop column antenna which consists of a mesh membrane material (tricot knitted gold plated wire) reflector and carbon fiber tension cords. The atomic oxygen in the plasma discharge state can force the wire base metal particles through the gold lattice and oxydize the metal particles to build a Schottky-barrier contact at the point where the wires meet. This effect can cause strong deviations in the reflector performance in terms of antenna pattern and losses. Also, the carbon-fiber cords can experience a strength reduction of 30 percent over a 40-hour exposure time.

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