Article (Scientific journals)
Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions
Moriconi, M. L.; Adriani, A.; Dinelli, B. M. et al.
2017In Geophysical Research Letters, 44 (10), p. 4641-4648
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Keywords :
JIRAM spectrometer; Jupiter atmosphere; Magnetosphere; NASA; Analysis method; Effective temperature; Excitation mechanisms; Jupiters; Particle precipitation; Peak emissions; Polar Regions; Spectral contribution; Methane
Abstract :
[en] 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 (CH4) near both poles through its 3.3 μm emission overlapping the H3 + auroral feature at 3.31 μm. Neither acetylene (C2H2) nor ethane (C2H6) have been observed so far. The analysis method, developed for the retrieval of H3 + temperature and abundances and applied to the JIRAM-measured spectra, has enabled an estimate of the effective temperature for methane peak emission and the distribution of its spectral contribution in the polar regions. The enhanced methane inside the auroral oval regions in the two hemispheres at different longitude suggests an excitation mechanism driven by energized particle precipitation from the magnetosphere. ©2017. American Geophysical Union. All Rights Reserved.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Moriconi, M. L.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy, CNR-Istituto di Scienze dell'Atmosfera e del Clima, Bologna, Italy
Adriani, A.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Dinelli, B. M.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy, CNR-Istituto di Scienze dell'Atmosfera e del Clima, Bologna, Italy
Fabiano, F.;  CNR-Istituto di Scienze dell'Atmosfera e del Clima, Bologna, Italy, Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
Altieri, F.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Tosi, F.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Filacchione, G.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Migliorini, A.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Gérard, Jean-Claude  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Mura, A.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Grassi, D.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Sindoni, G.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Piccioni, G.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Noschese, R.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Cicchetti, A.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Bolton, S. J.;  Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, United States
Connerney, J. E. P.;  NASA Goddard Space Flight Center, Greenbelt, MD, United States
Atreya, S. K.;  Planetary Science Laboratory, University of Michigan, Ann Arbor, MI, United States
Bagenal, F.;  Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Gladstone, G. R.;  Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, United States
Hansen, C.;  Planetary Science Institute, Tucson, AZ, United States
Kurth, W. S.;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Levin, S. M.;  Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Mauk, B. H.;  The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States
McComas, D. J.;  Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States
Turrini, D.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy, Departamento de Fisica, Universidad de Atacama, Copiapò, Chile
Stefani, S.;  INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Olivieri, A.;  Agenzia Spaziale Italiana, Rome, Italy
Amoroso, M.;  Agenzia Spaziale Italiana, Rome, Italy
More authors (19 more) Less
Language :
English
Title :
Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions
Publication date :
May 2017
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Blackwell Publishing Ltd
Volume :
44
Issue :
10
Pages :
4641-4648
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
2016-23-H.0.
Funders :
ASI - Agenzia Spaziale Italiana
Available on ORBi :
since 10 August 2017

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