|Instrument: WAVES : Radio and Plasma Wave Investigation|
Solar/Space Observing Instruments
Instrument Class: Radio Wave Detectors
Wavelength Keyword: Radio
Number Channels: 5
Spectral/Frequency Coverage/Range: 4 kHz - 14 MHz
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The Sun and the Earth emit radio waves that affect particles in the interplanetary plasma and carry some of the energy flowing there. The Radio and Plasma Wave experiment (WAVES) on WIND will measure the properties of these waves and other wave modes of the plasma over a wide frequency range. Analyses of these measurements, in coordination with the other onboard plasma, energetic particles, and field measurements, will further the understanding of solar wind and interplanetary plasma processes.
The sensor system of the WAVES experiment consists of three electric antenna systems (two coplanar, orthogonal wire antennas in the spin-plane and a rigid spin-axis dipole) and a triaxial magnetic search coil. The longer and shorter spin plane dipoles have lengths of 50 m and 7.5 m for each wire, respectively, while each spin-axis dipole extends 5.28 m from the top and bottom surfaces of the spacecraft. The triaxial magnetic search coil for measuring bi-frequency magnetic fields is mounted at the outboard end of a 12-m radial boom.
There are five main receiver systems: a bi-frequency (DC to 10 kHz) Fast Fourier Transform receiver, a broadband (4 kHz to 256 kHz) electron thermal noise receiver, two swept-frequency radio receivers (20 kHz to lMHz, and lMHz to 14 MHz), and a time domain waveform sampler (up to 120,000 samples per second). The DPU controls and acquires data from all operations of the experiment, and can be reprogrammed from the ground. The receiver systems and DPU are housed within the spacecraft body. WAVES has onboard interconnects with 3-D PLASMA and with SWE.
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Instrument Start Date: 1994-11-01
Instrument Owner: NASA
University of Minnesota