Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions

M. L. Moriconi, A. Adriani, B. M. Dinelli, F. Fabiano, F. Altieri, F. Tosi, G. Filacchione, A. Migliorini, J. C. Gérard, A. Mura, D. Grassi, G. Sindoni, G. Piccioni, R. Noschese, A. Cicchetti, S. J. Bolton, J. E.P. Connerney, S. K. Atreya, F. Bagenal, G. R. GladstoneC. Hansen, W. S. Kurth, S. M. Levin, B. H. Mauk, D. J. McComas, D. Turrini, S. Stefani, A. Olivieri, M. Amoroso

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)4641-4648
Number of pages8
JournalGeophysical Research Letters
Volume44
Issue number10
DOIs
StatePublished - May 28 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • JIRAM spectrometer
  • Jupiter atmosphere
  • methane fluorescence

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