دورية أكاديمية
Formation of the Thebe Extension in the Ring System of Jupiter
| العنوان: | Formation of the Thebe Extension in the Ring System of Jupiter |
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| المؤلفون: | Borisov, N., Krüger, H., 1 IZMIRAN Moscow Russia |
| سنة النشر: | 2021 |
| المجموعة: | GEO-LEOe-docs (SUB Göttingen / TU Bergakademie Freiberg) |
| مصطلحات موضوعية: | ddc:523, Thebe, cosmic dust, space plasma, electric fields, Jupiter ring system, planetary rings |
| الوصف: | Jupiter's tenuous dust ring system is embedded in the planet's inner magnetosphere, and—among other structures—contains a very tenuous protrusion called the Thebe extension. In an attempt to explain the existence of this swath of particles beyond Thebe's orbit, Hamilton and Krüger (2008), https://doi.org/10.1038/nature06886Test proposed that the dust particle motion is driven by a shadow resonance caused by variable dust charging on the day and night side of Jupiter. However, the model by Divine and Garrett (1983), https://doi.org/10.1029/ja088ia09p06889Test together with recent observations by the Juno spacecraft indicates a warm and rather dense inner magnetosphere of Jupiter which implies that the mechanism of the shadow resonance does not work. Instead, we argue that dust grains ejected from Thebe due to micrometeoroid bombardment become the source of dust in the Thebe extension. We show that large (grain radii of a few micrometers up to multi‐micrometers) charged dust grains having significant initial velocities oscillate in the Thebe extension. Smaller charged grains (with sub‐micrometer radii) ejected from Thebe do not spend much time in the Thebe extension and migrate into the Thebe ring. At the same time, if such grains are ejected from larger dust grains in the Thebe extension due to fragmentation, they continue to oscillate within the Thebe extension for years. We argue that fragmentation of large dust grains in the Thebe extensions could be the main source of sub‐micrometer grains detected in the Thebe extension. ; Key Points: In Jupiter's warm and dense inner magnetosphere dust grains acquire high negative electric charges. Dust particles ejected from Thebe with sufficient speeds contribute to the formation of the Thebe extension. Instead of shadow resonances as suggested earlier an alternative mechanism is suggested for the formation of the Thebe extension. ; Max Planck Institute for Solar System Research |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9856Test |
| DOI: | 10.1029/2021JA029654 |
| الإتاحة: | https://doi.org/10.1029/2021JA029654Test http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9856Test |
| حقوق: | This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| رقم الانضمام: | edsbas.7F353198 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2021JA029654 |
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