Geophysics; Geochemistry and Petrology; Earth and Planetary Sciences (miscellaneous); Space and Planetary Science
Abstract :
[en] In this work, we present the detection of CH4 and (Formula presented.) emissions in the equatorial atmosphere of Jupiter as two well-separated layers located, respectively, at tangent altitudes of about 200 and 500–600 km above the 1-bar level using the observations of the Jovian InfraRed Auroral Mapper (JIRAM), on board Juno. This provides details of the vertical distribution of (Formula presented.) retrieving its Volume Mixing Ratio (VMR), concentration, and temperature. The thermal profile obtained from (Formula presented.) shows a peak of 600–800 K at about 550 km, with lower values than the ones reported in Seiff et al. (1998), https://doi.org/10.1029/98JE01766 above 500 km using VMR and temperature as free parameters and above 650 km when VMR is kept fixed with that model in the retrieval procedure. The observed deviations from the Galileo's profile could potentially point to significant variability in the exospheric temperature with time. We suggest that vertically propagating waves are the most likely explanation for the observed VMR and temperature variations in the JIRAM data. Other possible phenomena could explain the observed evidence, for example, dynamic activity driving chemical species from lower layers toward the upper atmosphere, like the advection-diffusion processes, or precipitation by soft electrons, although better modeling is required to test these hypothesis. The characterization of CH4 and (Formula presented.) species, simultaneously observed by JIRAM, offers the opportunity for better constraining atmospheric models of Jupiter at equatorial latitudes.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Migliorini, A. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Dinelli, B.M. ; CNR-ISAC, Bologna, Italy
Castagnoli, C. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy ; CNR-ISAC, Bologna, Italy ; University of Tor Vergata, Rome, Italy
Moriconi, M.L. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Altieri, F. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Atreya, S.; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, United States
Adriani, A. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Mura, A. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Tosi, F. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Moirano, Alessandro ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Piccioni, G.; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Grassi, D. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Sordini, R. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Noschese, R. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Cicchetti, A. ; IAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Bolton, S.J.; Southwest Research Institute, San Antonio, United States
The JIRAM project is funded by the Italian Space Agency (ASI). In particular, this work has been developed under the Agreement 2016‐23‐H.0. Open Access Funding provided by Istituto nazionale di astrofisica within the CRUI‐CARE Agreement.The JIRAM project is funded by the Italian Space Agency (ASI). In particular, this work has been developed under the Agreement 2016-23-H.0. Open Access Funding provided by Istituto nazionale di astrofisica within the CRUI-CARE Agreement.
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