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Atmospheric flows imprint the high-degree gravity field of Jupiter

Presentation #302.08 in the session Giant Planet Interior Structure and Dynamics (Oral Presentation)

Published onOct 23, 2023
Atmospheric flows imprint the high-degree gravity field of Jupiter

Since the first gravity measurements of Juno at Jupiter, the odd gravity harmonics J3 to J9 have been used to determine the depth of the zonal wind observed at the cloud level. Later on, combining solutions from internal models, the gravity harmonics J6, J8 and J10 were added to the analysis, which reinforced the conclusion that the observed zonal flows extend to a depth of around 3,000 km and imprint the gravity signal. The harmonics higher than J10 were not used in the analysis since their individual uncertainty was too large. In this study, we revisit the wind-gravity analysis, when the gravity retrieval is constrained at the high latitudes, and show results for higher gravity harmonics up to J40. This gives more detail about the structure of the deep zonal flows and allows better explaining the structure of the measured gravity spectrum. This confirms that indeed the observed flows are the ones which imprint the gravity spectrum and that they are cylindrical. Moreover, this analysis allows to better determine which part of the wind field most contributes to the gravity signal, implying on the depth of individual jet streams. We also show how this analysis allows to refine the surface gravity field, particularly in the latitudinal range of the closest approach of the spacecraft.

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