Revisit of discrete energy bands in Galilean moon's footprint tails: remote signals of particle absorption
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916486936788992 |
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| author | Yang, Fan Xuzhi-Zhou Liu, Ying Sun, Yi-Xin Yin, Ze-Fan Hao, Yi-Xin Liu, Zhi-Yang Blanc, Michel Zhao, Jiu-Tong He, Dong-Wen Wu, Ya-Ze Wang, Shan Yue, Chao Zong, Qiu-Gang |
| author_facet | Yang, Fan Xuzhi-Zhou Liu, Ying Sun, Yi-Xin Yin, Ze-Fan Hao, Yi-Xin Liu, Zhi-Yang Blanc, Michel Zhao, Jiu-Tong He, Dong-Wen Wu, Ya-Ze Wang, Shan Yue, Chao Zong, Qiu-Gang |
| contents | Recent observations from the Juno spacecraft during its transit over flux tubes of the Galilean moons have identified sharp enhancements of particle fluxes at discrete energies. These banded structures have been suspected to originate from a bounce resonance between particles and standing Alfven waves generated by the moon-magnetospheric interaction. Here, we show that predictions from the above hypothesis are inconsistent with the observations, and propose an alternative interpretation that the banded structures are remote signals of particle absorption at the moons. In this scenario, whether a particle would encounter the moon before reaching Juno depends on the number of bounce cycles it experiences within a fixed section of drift motion determined by moon-spacecraft longitudinal separation. Therefore, the absorption bands are expected to appear at discrete, equally-spaced velocities consistent with the observations. This finding improves our understanding of moon-plasma interactions and provides a potential way to evaluate the Jovian magnetospheric models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11905 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revisit of discrete energy bands in Galilean moon's footprint tails: remote signals of particle absorption Yang, Fan Xuzhi-Zhou Liu, Ying Sun, Yi-Xin Yin, Ze-Fan Hao, Yi-Xin Liu, Zhi-Yang Blanc, Michel Zhao, Jiu-Tong He, Dong-Wen Wu, Ya-Ze Wang, Shan Yue, Chao Zong, Qiu-Gang Earth and Planetary Astrophysics Space Physics Recent observations from the Juno spacecraft during its transit over flux tubes of the Galilean moons have identified sharp enhancements of particle fluxes at discrete energies. These banded structures have been suspected to originate from a bounce resonance between particles and standing Alfven waves generated by the moon-magnetospheric interaction. Here, we show that predictions from the above hypothesis are inconsistent with the observations, and propose an alternative interpretation that the banded structures are remote signals of particle absorption at the moons. In this scenario, whether a particle would encounter the moon before reaching Juno depends on the number of bounce cycles it experiences within a fixed section of drift motion determined by moon-spacecraft longitudinal separation. Therefore, the absorption bands are expected to appear at discrete, equally-spaced velocities consistent with the observations. This finding improves our understanding of moon-plasma interactions and provides a potential way to evaluate the Jovian magnetospheric models. |
| title | Revisit of discrete energy bands in Galilean moon's footprint tails: remote signals of particle absorption |
| topic | Earth and Planetary Astrophysics Space Physics |
| url | https://arxiv.org/abs/2411.11905 |