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.

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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.

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