Please use this identifier to cite or link to this item:
|Title:||The Great Cold Spot in Jupiter's upper atmosphere|
|Authors:||Stallard, Tom S.|
Connerney, John E. P.
West, Robert A.
Thayer, Jeffrey P.
Hsu, Vicki W.
Johnson, Rosie E.
|Publisher:||American Geophysical Union (AGU), Wiley|
|Citation:||Geophysical Research Letters, 2017, 44|
|Abstract:||Past observations and modelling of Jupiter’s thermosphere have, due to their limited resolution, suggested that heat generated by the aurora near the poles results in a smooth thermal gradient away from these aurora, indicating a quiescent and diffuse flow of energy within the sub-auroral thermosphere. Here, we discuss VLT-CRIRES observations that reveal a small-scale localised cooling of ~200 K within the non-auroral thermosphere. Using IRTF-NSFCam images, this feature is revealed to be quasi-stable over at least a 15-year period, fixed in magnetic latitude and longitude. The size and shape of this “Great Cold Spot” vary significantly with time, strongly suggesting that it is produced by an aurorally-generated weather system: the first direct evidence of a long-term thermospheric vortex in the solar system. We discuss the implications of this spot, comparing it with short-term temperature and density variations at Earth.|
|Rights:||Copyright © 2017, American Geophysical Union (AGU), Wiley. Deposited with reference to the publisher’s open access archiving policy.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
Files in This Item:
|Stallard_et_al-2017-Geophysical_Research_Letters.pdf||Published (publisher PDF)||920.63 kB||Adobe PDF||View/Open|
Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.