Since 2017 the Juno spacecraft has observed a cyclone at the north pole of Jupiter surrounded by eight smaller cyclones arranged in a polygonal pattern. It is not clear why this configuration is so stable or how it is maintained. Here we use a time series of images obtained by the JIRAM mapping spectrometer on Juno to track the winds and measure the vorticity and horizontal divergence within and around the polar cyclone and two of the circumpolar ones. We find an anticyclonic ring between the polar cyclone and the surrounding cyclones, supporting the theory that such shielding is needed for the stability of the polygonal pattern. However, even at the smallest spatial scale (180 km) we do not find the expected signature of convection—a spatial correlation between divergence and anticyclonic vorticity—in contrast with a previous study using additional assumptions about the dynamics, which shows the correlation at scales from 20 to 200 km. We suggest that a smaller size, relative to atmospheric thickness, of Jupiter’s convective storms compared with Earth’s, can reconcile the two studies.
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JIRAM data are available online at the Planetary Data System (PDS) at https://pds-atmospheres.nmsu.edu/data_and_services/atmospheres_data/JUNO/jiram. The filenames of the images are listed in Supplementary Table 1. Calibrated, geometrically controlled radiance data mapped onto an orthographic projection centred on the north pole and velocity vectors derived from the radiance data are available in Supplementary Data 1–2.
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This research was carried out at the California Institute of Technology under a contract with the National Aeronautics and Space Administration (NASA), grant/cooperative agreement number 80NSSC20K0555, which was awarded to A.P.I., and a contract with the Juno mission, which is administered for NASA by the Southwest Research Institute. C.L. was supported by the 51 peg-b Postdoctoral Fellowship. JIRAM was supported by the Italian Space Agency through ASI‐INAF agreement numbers I/010/10/0, 2014‐050‐R.0, 2016-23-H.0 and 2016-1495 f23-H.1-2018. A.A., A.M., D.G. and F.T. were supported by INAF. C.P. and G.S. were supported by ASI. L.S. is funded by the Scripps Institution of Oceanography Postdoctoral Fellowship. P.K. acknowledges funding from JPL/NASA.
The authors declare no competing interests.
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Ingersoll, A.P., Ewald, S.P., Tosi, F. et al. Vorticity and divergence at scales down to 200 km within and around the polar cyclones of Jupiter. Nat Astron 6, 1280–1286 (2022). https://doi.org/10.1038/s41550-022-01774-0