The Galileo Plasma wave investigation |
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| Authors: | D A Gurnett W S Kurth R R Shaw A Roux R Gendrin C F Kennel F L Scarf S D Shawhan |
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| Institution: | (1) Department of Physics and Astronomy, The University of Iowa, 52242 Iowa City, IA, USA;(2) Centre National d'Etudes des Telecommunications/Centre de Recherches en Physique de l'Environment Terrestre et Planetaire, 92131 Issy-les-Moulineaux, Cedex, France;(3) Department of Physics, UCLA, 90024 Los Angeles, CA, USA |
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| Abstract: | The purpose of the Galileo plasma wave investigation is to study plasma waves and radio emissions in the magnetosphere of Jupiter. The plasma wave instrument uses an electric dipole antenna to detect electric fields, and two search coil magnetic antennas to detect magnetic fields. The frequency range covered is 5 Hz to 5.6 MHz for electric fields and 5 Hz to 160 kHz for magnetic fields. Low time-resolution survey spectrums are provided by three on-board spectrum analyzers. In the normal mode of operation the frequency resolution is about 10%, and the time resolution for a complete set of electric and magnetic field measurements is 37.33 s. High time-resolution spectrums are provided by a wideband receiver. The wideband receiver provides waveform measurements over bandwidths of 1, 10, and 80 kHz. These measurements can be either transmitted to the ground in real time, or stored on the spacecraft tape recorder. On the ground the waveforms are Fourier transformed and displayed as frequency-time spectrogams. Compared to previous measurements at Jupiter this instrument has several new capabilities. These new capabilities include (1) both electric and magnetic field measurements to distinguish electrostatic and electromagnetic waves, (2) direction finding measurements to determine source locations, and (3) increased bandwidth for the wideband measurements.Deceased |
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