Estimation of the Antenna Impedance of the Sensors aboard Scientific Spacecrafts

Details Estimation of the Antenna Impedance of the Sensors aboard Scientific Spacecrafts Estimation of the Antenna Impedance of the Sensors aboard Scientific Spacecrafts

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11b1606i&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11B-1606

Physics

0609 Antennas, 0619 Electromagnetic Theory, 0634 Measurement And Standards, 0654 Plasmas, 2411 Electric Fields (2712)

Scientific paper

It is not easy to know the impedance of electric field sensors aboard scientific spacecrafts because it drastically changes depending on the circumstances around the spacecraft. In this paper we estimated the impedance of wire antennas for wave measurements aboard GEOTAIL. The waveform of electric field can be calculated from the magnetic field waveform at the same time using the refractive indices, the permittivities and the directions of the k-vectors, under the assumption of cold plasmas. We used the waveforms of chorus emissions observed by WFC and detected the dependency of the impedance on the spin of the spacecraft.

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