Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.5157k&link_type=abstract
Journal of Geophysical Research, vol. 85, Oct. 1, 1980, p. 5157-5161.
Physics
2
Electric Potential, Electrical Measurement, Helios 1, Monopole Antennas, Satellite Rotation, Spacecraft Antennas, Lyman Alpha Radiation, Photoelectrons, Plasma Interactions, Sun
Scientific paper
Measurements of antenna potential on the Helios 1 spacecraft are presented and discussed. The behavior of the potential indicates that Lyman-alpha and shorter wavelengths play an important role in determining antenna and spacecraft potential, and that conversely, longer wavelengths are unimportant. As expected, a voltage spike usually occurs when the antenna is shadowed. However, when the spike is not present, the potential variations on an antenna which is not shadowed can be estimated. For this case, the spectrum is about (Fourier coefficient) 2 V x (2fo/f)2 where fo is the spacecraft spin frequency, and f is an even harmonic of the spin frequency. Suggestions for measuring low-frequency waves are briefly discussed in relation to the experimental results, and slight tipping of the spacecraft is recommended to avoid shadowing.
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