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The Formation of Saturn's and Jupiter's Electron Radiation Belts by Magnetospheric Electric Fields

文献类型：期刊论文

作者Hao, Yi-Xin3,4; Sun, Yi-Xin3,4; Roussos, Elias4; Liu, Ying3; Kollmann, Peter5; Yuan, Chong-Jing2; Krupp, Norbert4; Paranicas, Chris5; Zhou, Xu-Zhi3; Murakami, Go1
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2020-12-01
卷号905期号:1页码:13
关键词Van Allen radiation belt Planetary magnetosphere Outer planets Jupiter Saturn
ISSN号2041-8205
DOI10.3847/2041-8213/abca3f
英文摘要The existence of planetary radiation belts with relativistic electron components means that powerful acceleration mechanisms are operating within their volume. Mechanisms that bring charged particles planetward toward stronger magnetic fields can cause their heating. On the basis that electron fluxes in Saturn's radiation belts are enhanced over discrete energy intervals, previous studies have suggested that rapid inward plasma flows may be controlling the production of their most energetic electrons. However, rapid plasma inflows languish in the planet's inner magnetosphere, and they are not spatially appealing as a mechanism to form the belts. Here we show that slow, global-scale flows resulting from transient noon-to-midnight electric fields successfully explain the discretized flux spectra at quasi- and fully relativistic energies, and that they are ultimately responsible for the bulk of the highest energy electrons trapped at Saturn. This finding is surprising, given that plasma flows at Saturn are dominated by the planetary rotation; these weak electric field perturbations were previously considered impactful only over a very narrow electron energy range where the magnetic drifts of electrons cancel out with corotation. We also find quantitative evidence that ultrarelativistic electrons in Jupiter's radiation belts are accelerated by the same mechanism. Given that similar processes at Earth drive a less efficient electron transport compared to Saturn and Jupiter, the conclusion is emerging that global-scale electric fields can provide powerful relativistic electron acceleration, especially at strongly magnetized and fast-rotating astrophysical objects.
WOS关键词EXTREME-ULTRAVIOLET SPECTROSCOPE ; MAGNETIC-FIELD ; ZEBRA STRIPES ; ACCELERATION ; INTERCHANGE ; INJECTIONS ; ASYMMETRY ; MOTION
资助项目German Space Agency (DLR)[50 OH 1101] ; German Space Agency (DLR)[50 OH 1502] ; Max Planck Society ; National Natural Science Foundation of China[41421003] ; National Natural Science Foundation of China[41627805] ; China Space Agency[D020303] ; NASA Office of Space Science[NAS5-97271] ; NASA Office of Space Science[003] ; JSPS KAKENHI[19H01948]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000597984800001
出版者IOP PUBLISHING LTD
资助机构German Space Agency (DLR) ; Max Planck Society ; National Natural Science Foundation of China ; China Space Agency ; NASA Office of Space Science ; JSPS KAKENHI ; German Space Agency (DLR) ; Max Planck Society ; National Natural Science Foundation of China ; China Space Agency ; NASA Office of Space Science ; JSPS KAKENHI ; German Space Agency (DLR) ; Max Planck Society ; National Natural Science Foundation of China ; China Space Agency ; NASA Office of Space Science ; JSPS KAKENHI ; German Space Agency (DLR) ; Max Planck Society ; National Natural Science Foundation of China ; China Space Agency ; NASA Office of Space Science ; JSPS KAKENHI
源URL[http://ir.iggcas.ac.cn/handle/132A11/98773]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Zong, Qiu-Gang
作者单位1.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chofu, Tokyo, Japan
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China
4.Max Planck Inst Solar Syst Res, D-37077 Gottingen, Germany
5.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
推荐引用方式
GB/T 7714		 Hao, Yi-Xin,Sun, Yi-Xin,Roussos, Elias,et al. The Formation of Saturn's and Jupiter's Electron Radiation Belts by Magnetospheric Electric Fields[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,905(1):13.
APA Hao, Yi-Xin.,Sun, Yi-Xin.,Roussos, Elias.,Liu, Ying.,Kollmann, Peter.,...&Zong, Qiu-Gang.(2020).The Formation of Saturn's and Jupiter's Electron Radiation Belts by Magnetospheric Electric Fields.ASTROPHYSICAL JOURNAL LETTERS,905(1),13.
MLA Hao, Yi-Xin,et al."The Formation of Saturn's and Jupiter's Electron Radiation Belts by Magnetospheric Electric Fields".ASTROPHYSICAL JOURNAL LETTERS 905.1(2020):13.

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来源：地质与地球物理研究所

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