Plasma Wave Subsystem

Instrument on board the Voyager space probes

This diagram shows how the PWS and PRA share the Voyager antenna, and its overall location on the Voyager-type design Here the data recorded by the PWS on Voyager 1 is converted to audio

Plasma Wave Subsystem (sometimes called Plasma Wave System), abbreviated PWS, is an instrument that is on board the Voyager 1 and Voyager 2 unmanned probes of the Voyager program. The device is 16 channel step frequency receiver and a low-frequency waveform receiver that can measure electron density.[1] The PWS uses the two long antenna in a V-shape on the spacecraft, which are also used by another instrument on the spacecraft.[2] The instrument recorded data about the Solar System's gas giants, and about the outer reaches of the Heliosphere, and beyond.[3] In the 2010s, the PWS was used to play the "sounds of interstellar space" as the spacecraft can sample the local interstellar medium after they departed the Sun's heliosphere.[3] The heliosphere is a region essentially under the influence of the Sun's solar wind, rather than the local interstellar environment, and is another way of understanding the Solar System in comparison to the objects gravitationally bound (e.g in orbit) around Earth's Sun.

The PWS instrument plan was introduced in 1974 during the development of the Voyager program.[4] It was hoped it would help increase understanding of wave particle interactions and record data on the magnetospheres of planets like Jupiter and Saturn.[4] The instruments went on to record radio waves at Jupiter, Saturn, Uranus, and Neptune.[3]

The PWS instrument is one of the instruments that is a part of the Voyager interstellar mission, and they have operated for several decades after their 1977 launch into the 2010s.[5]

## Specifications

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List:[6]

* Mass: 1.4 kg (3.08 pounds)
* Average electrical power consumption: 1.3 watts
* Average data rate: 0.032 kbit/s
* Frequency range 10 Hz to 56 kHz[7]
* PWS/PRA Antenna:[4][8]
* Length of antenna: 10 meters (10.936 yards)
* Number of antenna: 2
* Angle between antenna: 90 degrees

## PWS and PRS

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PLS, another Plasma instrument, and PWS antenna are noted in this diagram. Note that the antenna are truncated in this diagram and are much longer than shown, extending out 10 meters. The PWS also needs electrical power to operate, which comes from the RTG (also on this diagram).

## See also

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* New Horizons (see plasma and high-energy particle spectrometer suite)
* Waves in plasmas
* Waves (Juno) (Spacecraft instrument aboard the Juno Jupiter orbiter of the 2010s)

## References

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1. ^ "NASA - NSSDCA - Experiment - Details". nssdc.gsfc.nasa.gov. Retrieved 2019-09-20.
2. ^ "Voyager - Spacecraft - Planetary Radio Astronomy (PRA) and Plasma Wave Subsystem (PWS)". voyager.jpl.nasa.gov. Retrieved 2019-09-20.
3. ^ a b c Adler, Doug (July 2, 2018). "Forty years and still going strong". Astronomy.com. Retrieved 2019-09-20.
4. ^ a b c "A Plasma Wave Investigation for the Voyager Mission". www-pw.physics.uiowa.edu. Retrieved 2019-09-20.
5. ^ "Voyager - Fast Facts". voyager.jpl.nasa.gov. Retrieved 2019-09-20.
6. ^ "NASA - NSSDCA - Experiment - Details".
7. ^ "Voyager - Spacecraft - Planetary Radio Astronomy (PRA) and Plasma Wave Subsystem (PWS)". voyager.jpl.nasa.gov. Retrieved 2019-09-20.
8. ^ "Voyager - Spacecraft - Planetary Radio Astronomy (PRA) and Plasma Wave Subsystem (PWS)". voyager.jpl.nasa.gov. Retrieved 2019-09-20.

## External links

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* PWS

* v
* t
* e

Voyager program

Spacecraft|

* Voyager 1
* Voyager 2

Components|

* MHW-RTG
* Cosmic Ray Subsystem (CRS)
* Infrared interferometer spectrometer and radiometer (IRIS)
* Plasma Wave Subsystem (PWS)
* Voyager Golden Record (contents)

Images|

* Pale Blue Dot
* Family Portrait

Voyager team|

* Stamatios Krimigis
* Carolyn Porco
* Raymond Heacock
* Jim Blinn
* Larry Soderblom
* Edward C. Stone
* Timothy Ferris

Related|

* Gravity assist
* Radioisotope thermoelectric generator
* Specific orbital energy of Voyager 1
* Titan IIIE
* Grand Tour program
* Rings of Jupiter
* NASA Deep Space Network
* Frank Drake
* Carl Sagan

Observation
targets|

| Exploration of Jupiter|

* and its moon Io
* with volcanos Masubi
* Pele
* Prometheus
* Surt

|

Exploration of Saturn|

* and its moon Enceladus
* with craters Dunyazad
* Shahrazad

Exploration of Uranus|

* and its rings

Exploration of Neptune|

* and its moon Triton

Popular culture|

* The Farthest (2017 documentary film)

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