JIRAM Observations of Volcanic Flux on Io: Distribution and Comparison to Tidal Heat Flow Models
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913513669132288 |
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| author | Pettine, M. Imbeah, S. Rathbun, J. Hayes, A. Lopes-Gautier, R. Mura, A. Tosi, F. Zambon, F. Bertolino, S. |
| author_facet | Pettine, M. Imbeah, S. Rathbun, J. Hayes, A. Lopes-Gautier, R. Mura, A. Tosi, F. Zambon, F. Bertolino, S. |
| contents | Juno has allowed clear, high-resolution imaging of Io's polar volcanoes using the Jovian Infrared Auroral Mapper (JIRAM) instrument. We have used data from JIRAM's M-band (4.78 um) imager from eleven Juno orbits to construct a global map of volcanic flux. This map provides short-term insight into the spatial distribution of volcanoes and the ways in which high- and low-latitude volcanoes differ. Using spherical harmonic analysis, we quantitatively compare our volcanic flux map to the surface heat flow distribution expected from models of Io's tidal heat deposition (summarized in de Kleer et al. 2019). Our observations confirm previously detected systems of bright volcanoes at high latitudes. Our study finds that both poles are comparably active and that the observed flux distribution is inconsistent with an asthenospheric heating model, although the south pole is viewed too infrequently to establish reliable trends. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_05717 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JIRAM Observations of Volcanic Flux on Io: Distribution and Comparison to Tidal Heat Flow Models Pettine, M. Imbeah, S. Rathbun, J. Hayes, A. Lopes-Gautier, R. Mura, A. Tosi, F. Zambon, F. Bertolino, S. Earth and Planetary Astrophysics Juno has allowed clear, high-resolution imaging of Io's polar volcanoes using the Jovian Infrared Auroral Mapper (JIRAM) instrument. We have used data from JIRAM's M-band (4.78 um) imager from eleven Juno orbits to construct a global map of volcanic flux. This map provides short-term insight into the spatial distribution of volcanoes and the ways in which high- and low-latitude volcanoes differ. Using spherical harmonic analysis, we quantitatively compare our volcanic flux map to the surface heat flow distribution expected from models of Io's tidal heat deposition (summarized in de Kleer et al. 2019). Our observations confirm previously detected systems of bright volcanoes at high latitudes. Our study finds that both poles are comparably active and that the observed flux distribution is inconsistent with an asthenospheric heating model, although the south pole is viewed too infrequently to establish reliable trends. |
| title | JIRAM Observations of Volcanic Flux on Io: Distribution and Comparison to Tidal Heat Flow Models |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2308.05717 |