Jovian plasma sheet density profile from low-frequency radio waves

Astronomy and Astrophysics – Astronomy

Scientific paper

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Jupiter Atmosphere, Planetary Magnetospheres, Plasma Layers, Space Plasmas, Flyby Missions, Planetary Radiation, Plasma Density, Radio Sources (Astronomy), Voyager Project, Jupiter, Plasma Sheet, Density, Radio Waves, Voyager Missions, Nightside, Pra Instrument, Pws Instrument, Mag Instrument, Spacecraft Observations, Plasma, Structure, Magnetosphere, Plasma Waves, Polarization, Frequencies, Solar Wind, Pressure, Thickness, Diagrams, Calculations, Lecp Instrument

Scientific paper

By using planetary radio astronomy (PRA), plasma wave system (PWS), and magnetometer (MAG) data from Voyager 1 and 2 (V1 and V2), essential features of the nightside Jovian plasma sheet are derived, and the density gradient of the corotating plasma structure in the middle Jovian magnetosphere is calculated. The PRA experiment gives information about the plasma wave polarization. The density profile of the plasma sheet is determined using the hinge point position of the plasma disk derived from MAG data, and the low-frequency cutoffs observed at three frequencies (562 Hz, 1 kHz, and 1.78 kHz) from the PWS experiment. It is shown that the hinge point position varies with the solar wind ram pressure.

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