GALILEO PWS EXTR

This data set contains ASCII version of the EDR data set (one file contains one day of PWS data) : wideband waveform measurements from the Galileo plasma wave receiver obtained during Venus encounter (1990/02/10), the first Earth encounter (1990/11/08 – 1990/12/16) and the second Earth encounter (1992/11/08 – 1992/12/20). These measurements are electric or magnetic waveforms obtained by rapidly sampling the potential at the input to the receiver from either the electric dipole antenna or the magnetic search coil antenna. The sample rates are 201,600 s^-1, 25, 200 s^-1, or 3,150 s^-1 taken through bandpass filters of 80, 10, or 1 kHz, respectively. Each sample is a 4-bit measurement after an automatic gain control (AGC) amplifier designed to keep the signal amplitude in a range commensurate with the optimal analog-to-digital converter dynamic range with a time constant of about 500 msec. As such, the measurements are not absolutely calibrated, although it is possible to determine the approximate AGC gain from a digital performance parameter available every 2.667 seconds, assuming the signal amplitude does not vary appreciably over the 2.667 second interval. Alternately, the sweep frequency receiver (low rate) portion of the instrument can be used to determine the absolute amplitude of waves. In many cases, the waveform data are used without any calibration for the purposes of identifying characteristic frequencies of the plasma via resonances or cutoffs, observing discrete emissions such as chorus or whistlers, or looking at the detailed form of the waveforms.