Detection of H3+ auroral emission in Jupiter's 5-micron window
<p>We use high-resolution ground-based observations from the VLT CRIRES instrument in November 2012 to identify sixteen previously undetected H3+ emission lines from Jupiter’s ionosphere. These emission lines are located in Jupiter’s 5-micron window (4.5−5.2 μm), an optically-thin region of th...
| Main Authors: | , , , |
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| Format: | Journal article |
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EDP Sciences
2016
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| _version_ | 1826278628198973440 |
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| author | Giles, R Fletcher, L Irwin, P al., E |
| author_facet | Giles, R Fletcher, L Irwin, P al., E |
| author_sort | Giles, R |
| collection | OXFORD |
| description | <p>We use high-resolution ground-based observations from the VLT CRIRES instrument in November 2012 to identify sixteen previously undetected H3+ emission lines from Jupiter’s ionosphere. These emission lines are located in Jupiter’s 5-micron window (4.5−5.2 μm), an optically-thin region of the planet’s spectrum where the radiation mostly originates from the deep troposphere. The H3+ emission lines are so strong that they are visible even against this bright background. We measure the Doppler broadening of the H3+ emission lines in order to evaluate the kinetic temperature of the molecules, and we obtain a value of 1390 ± 160 K. We also measure the relative intensities of lines in the ν2 fundamental in order to calculate the rotational temperature, obtaining a value of 960 ± 40 K. Finally, we use the detection of an emission line from the 2ν2(2)-ν2 overtone to measure a vibrational temperature of 925 ± 25 K. We use these three independent temperature estimates to discuss the thermodynamic equilibrium of Jupiter’s ionosphere.</p> |
| first_indexed | 2024-03-06T23:46:46Z |
| format | Journal article |
| id | oxford-uuid:71321221-e4c9-4e7d-8235-469d8f3ccbc6 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:46:46Z |
| publishDate | 2016 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:71321221-e4c9-4e7d-8235-469d8f3ccbc62022-03-26T19:42:03ZDetection of H3+ auroral emission in Jupiter's 5-micron windowJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:71321221-e4c9-4e7d-8235-469d8f3ccbc6Symplectic Elements at OxfordEDP Sciences2016Giles, RFletcher, LIrwin, Pal., E<p>We use high-resolution ground-based observations from the VLT CRIRES instrument in November 2012 to identify sixteen previously undetected H3+ emission lines from Jupiter’s ionosphere. These emission lines are located in Jupiter’s 5-micron window (4.5−5.2 μm), an optically-thin region of the planet’s spectrum where the radiation mostly originates from the deep troposphere. The H3+ emission lines are so strong that they are visible even against this bright background. We measure the Doppler broadening of the H3+ emission lines in order to evaluate the kinetic temperature of the molecules, and we obtain a value of 1390 ± 160 K. We also measure the relative intensities of lines in the ν2 fundamental in order to calculate the rotational temperature, obtaining a value of 960 ± 40 K. Finally, we use the detection of an emission line from the 2ν2(2)-ν2 overtone to measure a vibrational temperature of 925 ± 25 K. We use these three independent temperature estimates to discuss the thermodynamic equilibrium of Jupiter’s ionosphere.</p> |
| spellingShingle | Giles, R Fletcher, L Irwin, P al., E Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title | Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title_full | Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title_fullStr | Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title_full_unstemmed | Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title_short | Detection of H3+ auroral emission in Jupiter's 5-micron window |
| title_sort | detection of h3 auroral emission in jupiter s 5 micron window |
| work_keys_str_mv | AT gilesr detectionofh3auroralemissioninjupiters5micronwindow AT fletcherl detectionofh3auroralemissioninjupiters5micronwindow AT irwinp detectionofh3auroralemissioninjupiters5micronwindow AT ale detectionofh3auroralemissioninjupiters5micronwindow |