A planetary‐scale disturbance in the most intense Jovian atmospheric jet from JunoCam and ground‐based observations
2017
We describe a huge planetary-scale disturbance in the highest-speed Jovian jet at latitude
23.5°N that was first observed in October 2016 during the Juno perijove-2 approach. An extraordinary
outburst of four plumes was involved in the disturbance development. They were located in the range of
planetographic latitudes from 22.2° to 23.0°N and moved faster than the jet peak with eastward velocities in
the range 155 to 175 m s 1. In the wake of the plumes, a turbulent pattern of bright and dark spots (wave
number 20–25) formed and progressed during October and November on both sides of the jet, moving with
speeds in the range 100–125 m s 1 and leading to a new reddish and homogeneous belt when activity
ceased in late November. Nonlinear numerical models reproduce the disturbance cloud patterns as a result of
the interaction between local sources (the plumes) and the zonal eastward jet.
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