2.0.0 spase://SMWG/Instrument/DynamicsExplorer1/PWI Dynamics Explorer 1 Plasma Waves Instrument (PWI) DE 1 PWI 2019-05-05T12:34:56Z The Plasma Wave Instrument (PWI) measured ac electric fields over the frequency range from 1 Hz to 2 MHz, and an amplitude range of 0.03 microvolt per meter to 100 mV per meter. Magnetic fields were measured from 1 Hz to 400 kHz over an approximately 100-dB range. The objectives of this investigation were to measure the spatial, temporal, spectral, and wave characteristics (particularly the Poynting vector component along the magnetic field line) and the wave polarization for extremely-low-frequency (ELF), very-low-frequency (VLF), and high-frequency (HF) noise phenomena. Of special interest were the auroral kilometric radiation and VLF hiss, and a variety of electrostatic waves that may cause field-aligned acceleration of particles. The investigation made use of the long dipole antennas in the spin plane and along the Z axis, and a magnetic loop antenna. A single-axis search coil magnetometer and a short electric antenna were included for low-frequency measurements and electrostatic noise measurements at short wavelengths. The electronics consisted of * (1) a wideband/long baseline receiver with a bandwidth of 10 or 40 kHz in the range 0-2 MHz; * (2) a step-frequency correlator, containing two sweep-frequency receivers and phase detectors, sweeping 100 Hz to 400 kHz in 32 s, and giving the phase between magnetic and electric components of the field; * (3) a low-frequency correlator containing two filter receivers and phase detectors (eight filters in the range 1.78-100 Hz). The sweep rate is 8 s/spectra at the high frequency end (above 18 Hz); it is 32 s/spectra for frequencies for 1.8-10 Hz; * (4) dc monitors that measured the voltage difference between the two sets of long dipole antennas; and * (5) a linear wave receiver, selectable from 1.5 to 3.0, 3 to 6, or 10 to 16 kHz bands. The wideband receiver was flown to transmit wideband waveform signals to the ground via an analog transmitter, so that detailed high-resolution frequency-time analysis could be performed. Since June 23, 1984 a malfunction in the spacecraft data- handling system has prevented access to some PWI data. Digital measurements from the sweep frequency receiver system were no longer accessible. More details are found in S. D. Shawhan et al., Space Sci. Instrum., v. 5, n. 4, p. 535, 1981. spase://SMWG/Person/Donald.A.Gurnett PrincipalInvestigator NSSDC's Master Catalog https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1981-070A-02 Information about the Plasma Waves Instrument (PWI) experiment on the Dynamics Explorer 1 mission. ElectrostaticAnalyser Plasma Waves Instrument (PWI) on Dynamics Explorer 1 spase://SMWG/Observatory/DynamicsExplorer1