UVS (Juno)
![](/w/images/thumb/8/8e/Jupiter.Aurora.HST.UV.jpg/300px-Jupiter.Aurora.HST.UV.jpg)
![](/w/images/thumb/7/72/Jupiter_X-ray_Aurora_Chandra.jpg/300px-Jupiter_X-ray_Aurora_Chandra.jpg)
UVS, known as the Ultraviolet Spectrograph[3] or Ultraviolet Imaging Spectrometer[4] is the name of an instrument on the Juno orbiter for Jupiter.[3] The instrument is an imaging spectrometer that observes the ultraviolet range of light wavelengths, which is shorter wavelengths than visible light but longer than X-rays.[5] Specifically, it is focused on making remote observations of the aurora, detecting the emissions of gases such as hydrogen in the far-ultraviolet.[5] UVS will observes light from as short a wavelength as 70 nm up to 200 nm, which is in the extreme and far ultraviolet range of light.[5] The source of aurora emissions of Jupiter is one of the goals of the instrument.[6] UVS is one of many instruments on Juno, but it is in particular designed to operate in conjunction with JADE, which observes high-energy particles.[7] With both instruments operating together, both the UV emissions and high-energy particles at the same place and time can be synthesized.[7] This supports the Goal of determining the source of the Jovian magnetic field.[7] There has been a problem understanding the Jovian aurora, ever since Chandra determined X-rays were coming not from, as it was thought Io's orbit but from the polar regions.[1] Every 45 minutes an X-ray hot-spot pulsates, corroborated by a similar previous detection in radio emissions by Galileo and Cassini spacecraft.[1] One theory is that its related to the solar wind.[8] The mystery is not that there are X-rays coming Jupiter, which has been known for decades, as detected by previous X-ray observatories, but rather why with the Chandra observation, that pulse was coming from the north polar region.[9]
There is two main parts to UVS, the optical section and an electronics box.[5][10] It has a small reflecting telescope and also a scan mirror, and it can do long-slit spectrography.[11] UVS uses a Rowland circle spectrograph and a toroidal holographical grating.[5][12] The detector uses a micro-channel plate with the sensor being a CsI photocathode to detect the UV light[5][12]
UVS was launched aboard the Juno spacecraft on August 5, 2011 (UTC) from Cape Canaveral, USA, as part of the New Frontiers program,[13] and after an interplanetary journey that including a swingby of Earth, entered a polar orbit of Jupiter on July 5, 2016 (UTC),[14][15]
For detection of following gasses in the far UV:[5]
UVS is similar to, but with a number of changes compared to instruments flown on New Horizons (Pluto probe) and Rosetta (comet probe).[11] One of the changes is shielding to help the instrument endure Jupiter's radiation environment.[11]
The electronics are located inside the Juno Radiation Vault, which uses titanium to protect it and other spacecraft electronics.[10][16] The UVS electronics include two power supplies and data processing.[16] UVS electronics box uses a Actel 8051 microcontroller.[16]
UVS was developed at the Space Science Department at Southwest Research Institute[17]
See also
- Imaging spectrometer
- Ultraviolet astronomy
- Jovian Auroral Distributions Experiment
- Cosmic Origins Spectrograph
- Microwave Radiometer (Juno)
- Gravity Science
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ [1]
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 The Ultraviolet Spectrograph (UVS) on Juno - Gladstone, et al
- ↑ [2]
- ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ [3]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 10.0 10.1 Key and Driving Requirements for the Juno Payload Suite of Instruments
- ↑ 11.0 11.1 11.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 16.0 16.1 16.2 Lua error in package.lua at line 80: module 'strict' not found.
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