The Ultraviolet Spectrograph on NASA’s Juno Mission |
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Authors: | G Randall Gladstone Steven C Persyn John S Eterno Brandon C Walther David C Slater Michael W Davis Maarten H Versteeg Kristian B Persson Michael K Young Gregory J Dirks Anthony O Sawka Jessica Tumlinson Henry Sykes John Beshears Cherie L Rhoad James P Cravens Gregory S Winters Robert A Klar Walter Lockhart Benjamin M Piepgrass Thomas K Greathouse Bradley J Trantham Philip M Wilcox Matthew W Jackson Oswald H W Siegmund John V Vallerga Rick Raffanti Adrian Martin J-C Gérard Denis C Grodent Bertrand Bonfond Benoit Marquet François Denis |
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Institution: | 1.Southwest Research Institute,San Antonio,USA;2.Sensor Sciences,Pleasant Hill,USA;3.Laboratoire de Physique Atmosphérique et Planétaire,Université de Liège,Liège,Belgium;4.Centre Spatial de Liège,Liège,Belgium |
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Abstract: | The ultraviolet spectrograph instrument on the Juno mission (Juno-UVS) is a long-slit imaging spectrograph designed to observe and characterize Jupiter’s far-ultraviolet (FUV) auroral emissions. These observations will be coordinated and correlated with those from Juno’s other remote sensing instruments and used to place in situ measurements made by Juno’s particles and fields instruments into a global context, relating the local data with events occurring in more distant regions of Jupiter’s magnetosphere. Juno-UVS is based on a series of imaging FUV spectrographs currently in flight—the two Alice instruments on the Rosetta and New Horizons missions, and the Lyman Alpha Mapping Project on the Lunar Reconnaissance Orbiter mission. However, Juno-UVS has several important modifications, including (1) a scan mirror (for targeting specific auroral features), (2) extensive shielding (for mitigation of electronics and data quality degradation by energetic particles), and (3) a cross delay line microchannel plate detector (for both faster photon counting and improved spatial resolution). This paper describes the science objectives, design, and initial performance of the Juno-UVS. |
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