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Articles by D. Grassi
Preliminary JIRAM results from Juno polar observations: 2. Analysis of the Jupiter southern H3+ emissions and comparison with the north aurora
The Jupiter InfraRed Auroral Mapper (JIRAM) aboard Juno observed the Jovian South Pole aurora during the first orbit of the mission. H + (trihydrogen cation) and CH (methane) emissions have been identified and measured. The observations have been carried out in nadir and slant viewing both by a L-filtered imager and a 2–5 ?m spectrometer. Results from the spectral analysis of the all observations taken over the South Pole by the instrument are reported.
Multiple-wavelength sensing of Jupiter during the Juno mission's first perijove passage
Comparison of observations of Jupiter by different Juno and ground-based instruments verified some long-standing relationships, such as those between visibly dark regions and clear, dry parts of the atmosphere. But Juno saw significant exceptions. Different instrument results for the abundance of ammonia gas, a condensate similar to water in the Earth's atmosphere, at 5?bars of pressure were self-consistent and within the uncertainty of Galileo results.
Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions
Throughout the first orbit of the NASA Juno mission around Jupiter, the Jupiter InfraRed Auroral Mapper (JIRAM) targeted the northern and southern polar regions several times. The analyses of the acquired images and spectra confirmed a significant presence of methane (CH ) near both poles through its 3.3 ?m emission overlapping the H + auroral feature at 3.31 ?m. Neither acetylene (C H ) nor ethane (C H ) have been observed so far.
Preliminary results on the composition of Jupiter's troposphere in hot spot regions from the JIRAM/Juno instrument
The Jupiter InfraRed Auroral Mapper (JIRAM) instrument on board the Juno spacecraft performed observations of two bright Jupiter hot spots around the time of the first Juno pericenter passage on 27 August 2016. The spectra acquired in the 4–5?µm spectral range were analyzed to infer the residual opacities of the uppermost cloud deck as well as the mean mixing ratios of water, ammonia, and phosphine at the approximate level of few bars.
Characterization of the white ovals on Jupiter's southern hemisphere using the first data by the Juno/JIRAM instrument
During the first perijove passage of the Juno mission, the Jovian InfraRed Auroral Mapper (JIRAM) observed a line of closely spaced oval features in Jupiter's southern hemisphere, between 30°S and 45°S. In this work, we focused on the longitudinal region covering the three ovals having higher contrast at 5 ?m, i.e., between 120°W and 60°W in System III coordinates.
Preliminary JIRAM results from Juno polar observations: 1. Methodology and analysis applied to the Jovian northern polar region
During the first orbit around Jupiter of the NASA/Juno mission, the Jovian Auroral Infrared Mapper (JIRAM) instrument observed the auroral regions with a large number of measurements. The measured spectra show both the emission of the ion and of methane in the 3–4 ?m spectral region. In this paper we describe the analysis method developed to retrieve temperature and column density (CD) of the ion from JIRAM spectra in the northern auroral region.
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