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. Gladstone; C. Hansen; W. S. Kurth; S. M. Levin; B. H. Mauk; D. J. McComas; D. Turrini; S. Stefani; A. Olivieri; M. Amoroso

doi:10.1002/2017GL073592

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

Astrophysical Sciences

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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 language	English (US)
Pages (from-to)	4641-4648
Number of pages	8
Journal	Geophysical Research Letters
Volume	44
Issue number	10
DOIs	https://doi.org/10.1002/2017GL073592
State	Published - May 28 2017

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

Keywords

JIRAM spectrometer
Jupiter atmosphere
methane fluorescence

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10.1002/2017GL073592

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Moriconi, M. L., Adriani, A., Dinelli, B. M., Fabiano, F., Altieri, F., Tosi, F., Filacchione, G., Migliorini, A., Gérard, J. C., Mura, A., Grassi, D., Sindoni, G., Piccioni, G., Noschese, R., Cicchetti, A., Bolton, S. J., Connerney, J. E. P., Atreya, S. K., Bagenal, F., ... Amoroso, M. (2017). Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions. Geophysical Research Letters, 44(10), 4641-4648. https://doi.org/10.1002/2017GL073592

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

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.",

keywords = "JIRAM spectrometer, Jupiter atmosphere, methane fluorescence",

author = "Moriconi, {M. L.} and A. Adriani and Dinelli, {B. M.} and F. Fabiano and F. Altieri and F. Tosi and G. Filacchione and A. Migliorini and G{\'e}rard, {J. C.} and A. Mura and D. Grassi and G. Sindoni and G. Piccioni and R. Noschese and A. Cicchetti and Bolton, {S. J.} and Connerney, {J. E.P.} and Atreya, {S. K.} and F. Bagenal and Gladstone, {G. R.} and C. Hansen and Kurth, {W. S.} and Levin, {S. M.} and Mauk, {B. H.} and McComas, {D. J.} and D. Turrini and S. Stefani and A. Olivieri and M. Amoroso",

year = "2017",

month = may,

day = "28",

doi = "10.1002/2017GL073592",

language = "English (US)",

volume = "44",

pages = "4641--4648",

journal = "Geophysical Research Letters",

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Moriconi, ML, Adriani, A, Dinelli, BM, Fabiano, F, Altieri, F, Tosi, F, Filacchione, G, Migliorini, A, Gérard, JC, Mura, A, Grassi, D, Sindoni, G, Piccioni, G, Noschese, R, Cicchetti, A, Bolton, SJ, Connerney, JEP, Atreya, SK, Bagenal, F, Gladstone, GR, Hansen, C, Kurth, WS, Levin, SM, Mauk, BH, McComas, DJ, Turrini, D, Stefani, S, Olivieri, A & Amoroso, M 2017, 'Preliminary JIRAM results from Juno polar observations: 3. Evidence of diffuse methane presence in the Jupiter auroral regions', Geophysical Research Letters, vol. 44, no. 10, pp. 4641-4648. https://doi.org/10.1002/2017GL073592

TY - JOUR

T1 - Preliminary JIRAM results from Juno polar observations

T2 - 3. Evidence of diffuse methane presence in the Jupiter auroral regions

AU - Moriconi, M. L.

AU - Adriani, A.

AU - Dinelli, B. M.

AU - Fabiano, F.

AU - Altieri, F.

AU - Tosi, F.

AU - Filacchione, G.

AU - Migliorini, A.

AU - Gérard, J. C.

AU - Mura, A.

AU - Grassi, D.

AU - Sindoni, G.

AU - Piccioni, G.

AU - Noschese, R.

AU - Cicchetti, A.

AU - Bolton, S. J.

AU - Connerney, J. E.P.

AU - Atreya, S. K.

AU - Bagenal, F.

AU - Gladstone, G. R.

AU - Hansen, C.

AU - Kurth, W. S.

AU - Levin, S. M.

AU - Mauk, B. H.

AU - McComas, D. J.

AU - Turrini, D.

AU - Stefani, S.

AU - Olivieri, A.

AU - Amoroso, M.

PY - 2017/5/28

Y1 - 2017/5/28

N2 - 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.

AB - 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.

KW - JIRAM spectrometer

KW - Jupiter atmosphere

KW - methane fluorescence

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U2 - 10.1002/2017GL073592

DO - 10.1002/2017GL073592

M3 - Article

AN - SCOPUS:85019707302

SN - 0094-8276

VL - 44

SP - 4641

EP - 4648

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 10

ER -

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

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