Ground calibration results of the JUICE ultraviolet spectrograph

Davis, Michael W.; Gladstone, G. R.; Giles, Rohini; Greathouse, T. K.; Molyneux, Philippa M.; Raut, U.; Retherford, K. D.; Baldor, Sue; Versteeg, M. H.; Freeman, Matthew S.; Persson, Kristian; Persyn, Steven C.

doi:10.1117/12.2562986

Cited by 7 publications

(5 citation statements)

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“…Evidence of surface volatiles in Juno UVS spectra of Ganymede is an encouraging result from the perspective of the JUICE UVS instrument on the upcoming ESA JUICE mission (Grasset et al., 2013), which will end its tour of Jupiter's icy moons by entering a 500 km altitude orbit around Ganymede. The JUICE UVS bandpass of 50–204 nm (Davis et al., 2020) encompasses the H 2 O and NH 3 absorption features as well as the beginning of the possible O 3 feature at λ > 190 nm. JUICE UVS should therefore be able to map the absorption features discussed in this paper almost as well as Juno UVS in terms of wavelength coverage, but with better spatial resolution and coverage, and with considerably longer integration times to increase SNR.…”

Section: Discussionmentioning

confidence: 99%

Ganymede's UV Reflectance From Juno‐UVS Data

Molyneux

Greathouse

Gladstone

et al. 2022

Geophysical Research Letters

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During the Juno orbit 34 Ganymede encounter, the ultraviolet spectrograph mapped UV sunlight reflected by Ganymede from a closest approach altitude of 1,044 km, allowing us to study spatial variations in Ganymede's far ultraviolet reflectance at higher resolution than has previously been possible. We find that a characteristic signature of water ice seen around 165 nm in laboratory spectra is absent over much of the observed area, but is detectable in the north high latitude region. We suggest that the spectral difference between the high latitudes and other icy regions, such as Tros crater, may be explained by the presence of additional UV‐absorbing contaminants such as NH3 at lower latitudes. We also note a decrease in the relative reflectance of the high latitude regions at wavelengths >190 nm, which may be the start of a previously observed ozone absorption feature.

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Section: Discussionmentioning

confidence: 99%

Ganymede's UV Reflectance From Juno‐UVS Data

Molyneux

Greathouse

Gladstone

et al. 2022

Geophysical Research Letters

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“…The AP resolution is at all wavelengths and along-slit positions and is at most field positions for wavelengths in the range 70 - 130 nm (Davis et al. 2020 ). The HP resolution ranges from to ; again, the highest spatial resolution is achieved for wavelengths near 70–130 nm.…”

Section: Juice Instrumentationmentioning

confidence: 99%

“…The point source spectral resolution is <1 nm at all wavelengths when observing on-axis light (Davis et al. 2020 ).…”

Section: Juice Instrumentationmentioning

confidence: 99%

Jupiter Science Enabled by ESA’s Jupiter Icy Moons Explorer

Fletcher,

Cavalié,

Grassi

et al. 2023

Space Sci Rev

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ESA’s Jupiter Icy Moons Explorer (JUICE) will provide a detailed investigation of the Jovian system in the 2030s, combining a suite of state-of-the-art instruments with an orbital tour tailored to maximise observing opportunities. We review the Jupiter science enabled by the JUICE mission, building on the legacy of discoveries from the Galileo, Cassini, and Juno missions, alongside ground- and space-based observatories. We focus on remote sensing of the climate, meteorology, and chemistry of the atmosphere and auroras from the cloud-forming weather layer, through the upper troposphere, into the stratosphere and ionosphere. The Jupiter orbital tour provides a wealth of opportunities for atmospheric and auroral science: global perspectives with its near-equatorial and inclined phases, sampling all phase angles from dayside to nightside, and investigating phenomena evolving on timescales from minutes to months. The remote sensing payload spans far-UV spectroscopy (50-210 nm), visible imaging (340-1080 nm), visible/near-infrared spectroscopy (0.49-5.56 μm), and sub-millimetre sounding (near 530-625 GHz and 1067-1275 GHz). This is coupled to radio, stellar, and solar occultation opportunities to explore the atmosphere at high vertical resolution; and radio and plasma wave measurements of electric discharges in the Jovian atmosphere and auroras. Cross-disciplinary scientific investigations enable JUICE to explore coupling processes in giant planet atmospheres, to show how the atmosphere is connected to (i) the deep circulation and composition of the hydrogen-dominated interior; and (ii) to the currents and charged particle environments of the external magnetosphere. JUICE will provide a comprehensive characterisation of the atmosphere and auroras of this archetypal giant planet.

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“…Finally, the absolute effective area was measured as a function of wavelength through both the AP and SP channels. The results are summarized in the following pages; further details may be found in the JUICE-UVS calibration summary paper 9 .…”

Section: Calibrationmentioning

confidence: 99%

The JUICE ultraviolet spectrograph: a next-generation compact UVS for ESA’s JUICE mission

Davis¹,

Gladstone

Retherford

et al. 2021

International Conference on Space Optics — ICSO 2020

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Four compact planetary ultraviolet spectrographs have been built by Southwest Research Institute and successfully operated on different planetary missions: Rosetta-Alice, New Horizons-Alice, LRO-LAMP, and Juno-UVS. A fifth, JUICE-UVS, has been delivered to Airbus in preparation for ESA's JUICE mission to Ganymede and the Jovian system. This spectrograph features advancements that improve spatial resolution, maximum instantaneous count rates, and radiation background rejection when compared to previous spectrographs. A high-resolution port (HP) is added to improve the spatial resolution of the base UVS design by a factor of approximately 4, at a cost of 16 times worse signal-to-noise. The new design also allows solar occultations at Jupiter and its moons by reworking the SOCC that flew on New Horizons-Alice. JUICE-UVS will explore the Galilean satellites, investigate the dynamics and energetics of Io's atmosphere and torus, and characterize the dynamics and vertical structure of Jupiter's upper atmosphere.

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Ground calibration results of the JUICE ultraviolet spectrograph

Cited by 7 publications

References 0 publications

Ganymede's UV Reflectance From Juno‐UVS Data

Ganymede's UV Reflectance From Juno‐UVS Data

Jupiter Science Enabled by ESA’s Jupiter Icy Moons Explorer

The JUICE ultraviolet spectrograph: a next-generation compact UVS for ESA’s JUICE mission

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