Io Hot Spot Distribution Detected by Juno/JIRAM

Io Hot Spot Distribution Detected by Juno/JIRAM

In this work, we present the most updated catalog of Io hot spots based on Juno/JIRAM data. We find 242 hot spots, including 23 previously undetected. Over the half of the new hot spots identified, are located at high northern and southern latitudes (>70°). We observe a latitudinal variability an...

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Bibliographic Details
Published in:Geophysical research letters Vol. 50; no. 1
Main Authors: Zambon, F., Mura, A., Lopes, R. M. C., Rathbun, J., Tosi, F., Sordini, R., Noschese, R., Ciarniello, M., Cicchetti, A., Adriani, A., Agostini, L., Filacchione, G., Grassi, D., Piccioni, G., Plainaki, C., Sindoni, G., Turrini, D., Brooks, S., Hansen‐Koharcheck, C., Bolton, S.
Format: Journal Article
Language:English
Published: Washington John Wiley & Sons, Inc 16-01-2023
Wiley
Subjects:
Catalogues
Colour
Distribution
Hot spots
hotspots
Identification
Image acquisition
Image processing
Jupiter probes
Northern Hemisphere
planetary volcanism
Polar environments
Polar regions
remote sensing
Spacecraft
surfaces
Thermal emission
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Summary:In this work, we present the most updated catalog of Io hot spots based on Juno/JIRAM data. We find 242 hot spots, including 23 previously undetected. Over the half of the new hot spots identified, are located at high northern and southern latitudes (>70°). We observe a latitudinal variability and a larger concentration of hot spots in the polar regions, in particular in the North. The comparison between JIRAM and the most recent Io hot spot catalogs listing power output (Veeder et al., 2015, https://doi.org/10.1016/j.icarus.2014.07.028; de Kleer, de Pater, et al., 2019, https://doi.org/10.3847/1538-3881/ab2380), shows JIRAM detected 63% and 88% of the total number of hot spots, respectively. Furthermore, JIRAM observed 16 of the 34 faint hot spots previously identified. JIRAM data revealed thermal emission from 5 dark pateræ inferred to be active from color ratio images, thus confirming that these are hot spots. Plain Language Summary We mapped the hot spot distribution on Io's surface by analyzing the images acquired by the JIRAM instrument onboard the Juno spacecraft. We identified 242 hot spots, including 23 not present in other catalogs. A large number of the new hot spots identified are in the polar regions, specifically in the northern hemisphere. The comparison between our work and the most recent and updated catalog reveals that JIRAM detected 82% of the most powerful hot spots previously identified and half of the intermediate‐power hot spots, thus showing that these are still active. JIRAM detected 16 out of the 34 faint hot spots previously reported. The resolution of JIRAM may not have been sufficient to detect these faint hot spots, or activity might have faded or stopped. Key Points We produced a new Io hot spot map based on Juno/JIRAM data We identified 242 hot spots, including 23 previously undetected The latitudinal hot spot distribution is uneven with a larger concentration at the poles
ISSN:0094-8276
1944-8007
DOI:10.1029/2022GL100597