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Europa’s Sub-Surface Ice Observed with The Juno Microwave Radiometer

Presentation #509.03 in the session Icy Moons Interior and Ice Shell (Oral Presentation)

Published onOct 23, 2023
Europa’s Sub-Surface Ice Observed with The Juno Microwave Radiometer

When Juno flew within 360 km of Europa’s surface on 29 September, 2022, the Microwave Radiometer (MWR) partially mapped its ice shell at six frequencies ranging from 0.6 GHz to 22 GHz. The MWR observations cover a latitude range from ~20oS to ~50oN and a longitude range from 70oW to 50oE. The microwave radiance originates from beneath the surface, probing a range of depths from as deep as 28 km at 0.6 GHz to less than 20 m at 22 GHz, depending on the purity of the ice. The measured microwave brightness spectra indicate the presence of reflections beneath the surface, and contain information about the temperature as a function of depth and about the uniformity of ice shell properties at depth. We will present analysis of the data and discuss the implications.

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