Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jass...13..206r&link_type=abstract
Journal of Astronomy and Space Sciences, vol. 13, no. 2, p. 206-214.
Astronomy and Astrophysics
Astronomy
2
Scientific paper
As a High-Voltage (HV) system applied high positive potential between a spherical probe and vehicle body during the flight, the payload body was biased to a negative potential of -2kV with respect to the background plasma, attracting ions and emitting the secondary electrons to achieve current balance in the payload system. A High Speed Data System (HSDS) provided a detailed wave form of the ion return current, electron current, and sphere potential as a result of sampling digitized at a rate of 1MHz. Even with the interference of large ion sheath, the experimental steady-state current was greater than the Parker-Murphy's lower limit of current collection. In addition, the steady-state current to the payload body was smaller than the Langmuir-Blodgett's upper limit of current collection although the emitted secondary electron increased the current on the vehicle body. Because the deployed boom was L shape, the ion return current collection was affected by the electron sheath. The effective area was reduced to 540 times of Skin Current Probe-1 (SCP-1) area near the apogee from the geometric factor of approximately 600.
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