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(a) A map of Europa’s trailing hemisphere, showing a selection of four of the 29 considered “rings of constant radiolysis” outlined in black, which are used to determine whether the weak 2.07 µm absorption feature is associated with Europa’s large-scale geologic units. The chaos terrains are shown in red and Pwyll crater and its ejecta are orange. For each ring, projected detector pixels are shown and their assigned geologic unit indicated by color, where chaos terrains are dark red, Pwyll crater and its ejecta are orange, and the ridged plains are gray. (Europa map image credit: NASA/JPL/ Bj¨orn J´onsson). -- astro-ph.EP

Astrogeology, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Europa, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography

The Spatial Distribution of the Unidentified 2.07 μm Absorption Feature on Europa and Implications for its Origin

by Keith CowingAugust 30, 2023August 30, 2023

A weak absorption feature at 2.07 μm on Europa’s trailing hemisphere has been suggested to arise from radiolytic processing of an endogenic salt, possibly sourced from the interior ocean.

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The Spatial Distribution of the Unidentified 2.07 μm Absorption Feature on Europa and Implications for its Origin

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