The H3+ ionosphere of Uranus: decades-long cooling and local-time morphology

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Henrik MelinMohammad N Chowdhury

Abstract

The upper atmosphere of Uranus has been observed to be slowly cooling between 1993 and 2011. New analysis of near-infrared observations of emission from H3+ obtained between 2012 and 2018 reveals that this cooling trend has continued, showing that the upper atmosphere has cooled for 27 years, longer than the length of a nominal season of 21 years. The new observations have offered greater spatial resolution and higher sensitivity than previous ones, enabling the characterization of the H3+ intensity as a function of local time. These profiles peak between 13 and 15 h local time, later than models suggest. The NASA Infrared Telescope Facility iSHELL instrument also provides the detection of a bright H3+ signal on 16 October 2016, rotating into view from the dawn sector. This feature is consistent with an auroral signal, but is the only of its kind present in this comprehensive dataset. This article is part of a discussion meeting issue 'Advances in hydrogen molecular ions: H3+, H5+ and beyond'.

References

Jul 4, 1986·Science·N F NessF M Neubauer
Feb 10, 2011·Faraday Discussions·Steve MillerJonathan Tennyson
Jul 19, 2013·The Journal of Physical Chemistry. a·Steve MillerHenrik Melin
Jun 16, 2018·Geophysical Research Letters·Daniel ToledoGlenn S Orton

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Citations

Aug 6, 2019·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Jonathan Tennyson, Steve Miller
Aug 6, 2019·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·L MooreC A Schmidt
Mar 14, 2020·Space Science Reviews·Leigh N FletcherDaniel Toledo
Nov 10, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Carol PatyAbigail M Rymer
Nov 10, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·L MooreJ O'Donoghue
Nov 10, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Henrik Melin
Nov 10, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·L Lamy

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