900-miles-per-hour winds rage on the gargantuan gas ball.
This view of Jupiter’s turbulent atmosphere from NASA’s Juno spacecraft includes several of the planet’s southern jet streams.An international team of astronomers just measured Jupiter’s raging stratospheric winds for the very first time—and they used a 27-year-old comet to do it.
, a planetary scientist at the Laboratoire d’Astrophysique de Bordeaux who led the experiment. The team found 300- to 400-meter-per-second winds— roughly 700 to 900 miles per hour—whipping across the poles in unanticipated directions., a planetary scientist at Berkeley who has used ALMA previously but was not part of this study. She adds, “it’s a really great paper, they really show very nicely these wind profiles in the … upper atmosphere.
For decades, the easiest way to figure out planetary wind speeds was to simply take a snapshot of the planet, then another one some time later and see how far the clouds moved between the two frames, Cavalié says. But at higher altitudes this doesn’t work, because the winds are invisible. There are no clouds to track.
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