Hot CH4 in the polar regions of Jupiter

Kim, Sang Joon; Sim, Chae Kyung; Jin, Ho; Geballe, T. R.; Yung, Yuk L.; Miller, Steve; Kim, Yong Ha

doi:10.1016/j.icarus.2015.05.008

Cited by 14 publications

(30 citation statements)

References 18 publications

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“…Kim et al . [] results suggest that polar CH 4 molecules are excited by sources whose energy distributions are similar throughout the auroral regions, although the absolute energy inputs may be different from region to region.…”

Section: Discussionmentioning

confidence: 99%

“…The temperature obtained for the blue region is in agreement with those found over the 8 µm hot spot by Kim et al . []; in this work values < 350 K are reported, while temperatures as high as 500–850 K were observed on the bright 3 µm spots imaged using the Gemini Near‐InfraRed Spectrograph data. Also the H 3 + temperatures retrieved in our study are systematically lower than those reported in the literature for the VIMS spectra [ Stallard et al ., ] and ground‐based data [ Lam et al ., ; Stallard et al ., ; Raynaud et al ., ; Lystrup et al ., ] which are around 800–1000 K. We have repeated the analysis of the spectrum of the orange area including only H 3 + in the simulation.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the morphology of the methane emission seems to overlap the position of the 8 µm CH 4 hot spot inside the main oval region with effective temperature close to that reported by Kim et al . [] but lower than those found on the bright 3 µm spot. Also C 2 H 2 ‐emitting area appears to cover a region at high latitudes inside the main oval, where there is evidence from the fit of NIMS spectra of a lower concentration of H 3 + molecules.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the northern 8 µm CH 4 hot spot seems to be stationary around 180° longitude (SysIII) since its first detection in early 1980s, with a morphology similar to that of the 13 µm C 2 H 2 [ Sada et al ., ] and of the 3 µm CH 4 [ Kim et al ., ] polar emissions but with a spatial distribution distinct from the IR H 3 + auroral feature and H 2 emissions [ Raynaud et al ., ]. Acetylene (C 2 H 2 ), together with ethane (C 2 H 6 ), is one of the most abundant product of CH 4 dissociation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

Altieri

Dinelli

Migliorini

et al. 2016

Geophysical Research Letters

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In this paper we report the mapping of H3+, C2H2, and CH4 as derived by an unexploited Galileo/Near‐Infrared Mapping Spectrometer (NIMS) data set. As previously observed, hydrocarbons emissions appear to be located in the internal part of the auroral main oval, where CH4 3 µm vibrational band intensity ratios suggest that nonthermal excitation mechanisms, such as auroral particle precipitation and/or Joule heating, are responsible for the observed emissions. Temperature estimation are in good agreement for the CH4‐emitting region on the hot spot, while the values obtained for H3+ are lower in comparison with Cassini/visual and infrared mapping spectrometer and ground‐based data. C2H2 emission overlaps the CH4 one only at higher latitudes >75°N, indicating that different energetic particles are at work inside the main oval polar ward. CH4 is also found on the northern section of the main oval (135°< longitude <190°, 60°< latitude <90°N). The present investigation results have implications on the Juno/Jovian InfraRed Auroral Mapper observation planning as well as on the codes that will be used to retrieve temperatures and densities of all the emitting species involved in the Jupiter auroral processes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

Altieri

Dinelli

Migliorini

et al. 2016

Geophysical Research Letters

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“…These hot spots occur close to similar hot CH 4 and H + 3 emission [17] and are heated due to the channeling of particles by the strong magnetic field. The Juno mission [18] is due to arrive at Jupiter in 2016 and one major objective for the Jovian Infrared Auroral Mapper, JIRAM [19], is to study these auroral hot spots to determine the molecules responsible and their vertical structure.…”

Section: Introductionmentioning

confidence: 76%

Relative high-resolution absorption cross sections of C2H6 at low temperatures

Hargreaves

Bernath

Appadoo

2015

Journal of Molecular Spectroscopy

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Infrared absorption cross sections near 3.3 µm have been obtained for ethane, C 2 H 6 . These were acquired at elevated temperatures (up to 773 K) using a Fourier transform infrared spectrometer and tube furnace with a resolution of 0.005 cm −1 . The integrated absorption was calibrated using composite infrared spectra taken from the Pacific Northwest National Laboratory (PNNL). These new measurements are the first high-resolution infrared C 2 H 6 cross sections at elevated temperatures.

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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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Hot CH4 in the polar regions of Jupiter

Cited by 14 publications

References 18 publications

Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

Relative high-resolution absorption cross sections of C2H6 at low temperatures

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

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Hot CH4 in the polar regions of Jupiter

Cited by 14 publications

References 18 publications

Mapping of hydrocarbons and H3+ emissions at Jupiter's north pole using Galileo/NIMS data

Mapping of hydrocarbons and H3+ emissions at Jupiter's north pole using Galileo/NIMS data

Relative high-resolution absorption cross sections of C2H6 at low temperatures

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

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Product

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Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

Mapping of hydrocarbons and H₃⁺ emissions at Jupiter's north pole using Galileo/NIMS data

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