The plume sites of Europe do not have the expected heat signatures

The study of two potential sites of plume on Jupiter Europa's moon has shown a lack of signatures expected from hot spots, unlike Enceladus where plumes have a very clear and obvious temperature signature, according to researcher Julie Rathbun's research principal at the Planetary Science Institute.

"We searched Galileo's available thermal data at proposed locations as potential plume sites." The reanalysis of Galileo mission temperature data does not show anything special where plumes have likely been observed. hotspot sites, "said Rathbun.

"This is surprising, because Enceladus plumes have a clear thermal signature on their original site, so this suggests that Europa plumes are very different, or that they are occasional, or that they do not have a clear thermal signature. not exist, or that their signature is too small to have been detected by the current data. "

Plumes are throws of gas sent from the surface of a planet up, similar to Old Faithful in Yellowstone National Park. For the gas to be projected upwards, an energy source is needed. Generally, this energy source will also heat the surface around the plume source, as seen in Yellowstone with hot spots near geysers and nearby hot springs.

This is also what we see on Enceladus, a hot area where plumes escape from the Enceladus surface. The hotspots at Yellowstone and Enceladus are undeniable and easily observable. The lack of hotspot in Europa suggests that hotspots are very different or nonexistent.

Rathbun's findings, entitled "Detailed Review of Galileo Thermal Data from Potential Sources of Plume near Pwyll, Europa", were presented at a press conference held at the 50th Annual Meeting of the Division of Public Health. planetary sciences of the American Astronomical Society at Knoxville, Tennessee.

Rathbun's work builds on earlier observations suggesting a plume from an area north of Pwyll on Europa. Reanalysis of the Galileo magnetometer and plasma data also suggest a plume source located about 1000 kilometers northeast of the first site.

Rathbun's work was funded in part by a subcontract with the E-Themis Mission (Europa Thermal Imaging System) from Arias State University of Arizona State University.

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