Juno finally got close enough to Jupiter's Great Red Spot to measure its depth

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Into the eye of the red storm.

, an atmospheric dynamicist, at the Weizmann Institute of Science in Israel and an author on both studies. He studies the atmosphere of Earth and other planets.

The increased density of the Great Red Spot compared to the surrounding atmosphere creates “a little mass anomaly,” Kaspi says. It’s almost as if the storm behaves like a small planet would, using its gravity to tug on the spacecraft harder than the surrounding space. And “if you’re accurate enough” one can measure the pull of the anomaly to figure out how massive the storm is.

The microwave data study was able to discern more about the structure of the Great Red Spot. Juno’s microwave instrument has six different frequency channels with which to probe hundreds of kilometers beneath the surface of Jupiter. Each frequency penetrates to a different depth and paints a picture of that layer, says, a planetary scientist at the SETI Institute and the University of California, Berkeley, who is also an author on both studies.

Luckily, the gravitational data, though lacking in any fine details on the structure of the Great Red Spot, was able to measure the density of the storm, and the gravity team used a model to determine, for a given gravity signal, how deep the storm should extend.

 

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