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Measurements of the rotation rate of the jovian mid-to-low latitude ionosphere

Johnson, RE; Stallard, TS; Melin, H; Miller, S; Nichols, JD; (2016) Measurements of the rotation rate of the jovian mid-to-low latitude ionosphere. ICARUS , 280 pp. 249-254. 10.1016/j.icarus.2016.06.026. Green open access

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Abstract

Previous studies of Jupiter's upper atmosphere often assume that the mid-to-low latitude ionosphere is corotating, but a model describing an observed asymmetry in hydrogen Lyman-α emission (∼1000 km above the 1 bar level) disagrees with this assumption. From measurements of the Doppler shifted View the MathML source line at 3.953 μ m using the IRTF, the line-of-sight velocities of the View the MathML source ions were derived in the planetary reference frame and found to be 0.091 ± View the MathML source, 0.0082 ± View the MathML source and 0.31 ± View the MathML sourcein 1998, 2007 and 2013 respectively. These zero velocities represent corotation at the mid-to-low latitude region of Jupiter's ionosphere. There is no evidence of flows associated with the hydrogen Lyman-α emission asymmetries detected in the peak View the MathML source emission layer (∼550 km above the 1 bar level), and we assert that the View the MathML source ions in Jupiter's mid-to-low latitude are rigidly corotating.

Type: Article
Title: Measurements of the rotation rate of the jovian mid-to-low latitude ionosphere
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.icarus.2016.06.026
Publisher version: http://dx.doi.org/10.1016/j.icarus.2016.06.026
Language: English
Additional information: © 2016 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Jupiter, atmospheres, Ionosphere, Infrared observations, Spectroscopy, LYMAN-ALPHA-EMISSION, JUPITERS THERMOSPHERE, UPPER-ATMOSPHERE, H-3(+) EMISSION, AURORAL OVAL, DYNAMICS, MAGNETOSPHERE, PROFILE, MODEL
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Science and Technology Studies
URI: https://discovery.ucl.ac.uk/id/eprint/1526821
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