Torsional oscillations in Jupiter and their link to the weather layer variability

Kumiko Hori ( Kobe University, Japan)

Wednesday 31st January 15:00-16:00 Maths 309

Abstract

Jupiter’s weather layer exhibits long-term quasi-periodic cycles of meteorological activity, which were recently characterised by ground-based infrared observations. We show that the periodic variability in part could be accounted for by torsional Alfvén waves/oscillations arising from the deep dynamo region, based on Juno spacecraft’s magnetic measurements. The nature of those waves is revealed by a data-driven technique, dynamic mode decomposition, applied to the infrared spatiotemporal data. Our results imply exploration of these MHD waves may provide a new window to the internal dynamics and dynamo of the gas giant. 

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