Jupiter's hydrocarbon polar brightening: Discovery of 3-micron line emission from south polar CH4, C2H2, and C2H6

Kim, Sang J.; Geballe, T. R.; Seo, Hye Sook; Kim, J.H.

doi:10.1016/j.icarus.2009.03.020

Cited by 17 publications

(20 citation statements)

References 32 publications

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“…4), as was reported by Kim et al (2009), but are not apparent in the equatorial spectra (Figs. 3 and 5).…”

Section: Overview Of Spectrasupporting

confidence: 81%

“…All of the clearly detected CH 4 emission lines belong to the m 3 + m 4 À m 4 band. These lines were strongest in the south polar region, as reported in Kim et al (2009). In addition, emission lines of the m 7 band of C 2 H 6 were detected in both polar regions ) and also are strongest near the south pole.…”

Section: Overview Of Spectrasupporting

confidence: 81%

“…We adopted the line positions, intensities, lower state energies, and widths used by J.H. Kim et al or updated by Seo et al (2009) and Kim et al (2009), with the exception of NH 3 for which we used HITRAN 2008 (Rothman et al, 2009). The program also includes the effects of isotropic scattering and absorption of spherical haze or cloud particles, as described in J.H.…”

Section: Radiative Transfer Program and Model Assumptionsmentioning

confidence: 99%

“…For the temperature-pressure-profiles we adopted published results for the equatorial and polar regions from spacecraft investigations (Voyager, Galileo, and Cassini) that we had used previously (e.g., Kim et al, 1985Kim et al, , 1993Kim et al, , 2009. We note that the effects of temperature variations on the 3-lm synthetic spectra, which are mostly affected by the properties and distribution of the particles reflecting sunlight, are minimal compared with the effect on thermal mid-infrared synthetic spectra.…”

Section: Radiative Transfer Program and Model Assumptionsmentioning

confidence: 99%

“…These spectra whose resolution is significantly higher than any previously shown in the literature reveal rich emission and absorption spectra of CH 4 , C 2 H 2 , and C 2 H 6 . A small portion of the spectra, covering the wavelength ranges 2.98-3.04 lm and 3.322-3.342 lm were presented in a short note by Kim et al (2009), which reported the detection of emission lines of these species from the south polar region. In this paper we include spectra at other wavelength ranges and other latitudinal regions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

Kim¹,

Geballe²,

Kim³

et al. 2010

Icarus

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“…4), as was reported by Kim et al (2009), but are not apparent in the equatorial spectra (Figs. 3 and 5).…”

Section: Overview Of Spectrasupporting

confidence: 81%

Section: Overview Of Spectrasupporting

confidence: 81%

Section: Radiative Transfer Program and Model Assumptionsmentioning

confidence: 99%

Section: Radiative Transfer Program and Model Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

Kim¹,

Geballe²,

Kim³

et al. 2010

Icarus

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Preliminary JIRAM results from Juno polar observations: 2. Analysis of the Jupiter southern H₃⁺ emissions and comparison with the north aurora

Adriani

Mura

Moriconi

et al. 2017

Geophysical Research Letters

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The Jupiter InfraRed Auroral Mapper (JIRAM) aboard Juno observed the Jovian South Pole aurora during the first orbit of the mission. H3+ (trihydrogen cation) and CH4 (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 μm spectrometer. Results from the spectral analysis of the all observations taken over the South Pole by the instrument are reported. The coverage of the southern aurora during these measurements has been partial, but sufficient to determine different regions of temperature and abundance of the H3+ ion from its emission lines in the 3–4 μm wavelength range. Finally, the results from the southern aurora are also compared with those from the northern ones from the data taken during the same perijove pass and reported by Dinelli et al. (2017).

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

Moriconi

Adriani

Dinelli

et al. 2017

Geophysical Research Letters

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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.

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Jupiter's hydrocarbon polar brightening: Discovery of 3-micron line emission from south polar CH4, C2H2, and C2H6

Cited by 17 publications

References 32 publications

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

Preliminary JIRAM results from Juno polar observations: 2. Analysis of the Jupiter southern H₃⁺ emissions and comparison with the north aurora

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

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Jupiter's hydrocarbon polar brightening: Discovery of 3-micron line emission from south polar CH4, C2H2, and C2H6

Cited by 17 publications

References 32 publications

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

High-resolution 3-μm spectra of Jupiter: Latitudinal spectral variations influenced by molecules, clouds, and haze

Preliminary JIRAM results from Juno polar observations: 2. Analysis of the Jupiter southern H3+ emissions and comparison with the north aurora

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

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Preliminary JIRAM results from Juno polar observations: 2. Analysis of the Jupiter southern H₃⁺ emissions and comparison with the north aurora