Jovian plasma sheet density profile from low-frequency radio waves
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. To determine the density profile of the plasma sheet, we have derived the hinge point position of the plasma disc from MAG data and used the low‐frequency cutoffs observed at three frequencies (562 Hz, 1 kHz, and 1.78 kHz) from the PWS experiment. We show that the hinge point position varies with the solar wind ram pressure, and the plasma disc thickness decreases with distance up to about 60 RJ. The average thickness for an isodensity contour corresponding to 1 kHz is 3.29 RJ for V1 and 3.16 RJ for V2.