Juno Data Suggests Io's Volcanic Output Underestimated by an Order of Magnitude

The Juno mission's JIRAM instrument has provided new insights into the thermal output of Io, the most volcanically active body in our solar system. Previous estimates, based on M-band infrared data, primarily focused on the high-temperature peripheral rings of Io's volcanic paterae, essentially lava lakes. These estimates significantly underestimated the contribution of the cooler, but much more extensive, crustal areas. The new data suggests that the total thermal output of Io may be an order of magnitude higher than previously thought. This has significant implications for our understanding of Io's internal dynamics, tidal heating mechanisms, and its interaction with Jupiter's magnetosphere. The study focused on 32 of Io's 400 paterae, with P63 serving as a key test subject. JIRAM's ability to capture the thermal output of the lower temperature crustal areas allowed researchers to revise the power estimate for P63 from 7-20 GW to a staggering 80 GW. Furthermore, the data enabled the calculation of the resurfacing age of the crusts, estimating a 200 K crust to be approximately 13 years old. This research underscores the importance of comprehensive data collection strategies in planetary science and highlights the potential for significant revisions in our understanding of planetary processes as new data becomes available. The findings will likely prompt a re-evaluation of existing models of Io's volcanism and its role in the Jovian system.

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