Jupiter’s North Equatorial Belt and Jet: III. The ‘great northern upheaval’ in 2012
This paper is in press in the Journal of the BAA (2018).
The complete paper including figures (small copies) is in this PDF: NEB_paperIII_Complete_Final.pdf
In Paper II we described the extreme changes in Jupiter’s North Equatorial Belt (NEB) which took place in 2011-12: quiescence, narrowing, and fading of the belt, along with acceleration of the prograde NEBs jet to super-fast speed. Here we describe how this anomalous state was terminated in 2012, in a rapid and vigorous disturbance known as a NEB Revival – the first in living memory. At the same time, the North Temperate Belt (NTB) had entered a similar preparatory state, which was terminated by a NTB Revival initiated by a typical outbreak on the super-fast NTBs jet. The two concurrent Revivals appeared to constitute a ‘great northern upheaval’ that extended from the equator to ~38ºN, which may have been the first such event ever recorded. We compare this dual event with the more typical ‘Global Upheavals’, which consist of near-simultaneous Revivals of the NTB and the South Equatorial Belt (SEB), along with equatorial coloration, and we discuss the current understanding of Global Upheavals.
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