A Rapid Localized Deceleration of Earth's Radiation Belt Relativistic Electrons Driven by Storm Proton Injection

Chen, Zewen1; Su, Zhenpeng2,3; He, Zhaoguo1; Wu, Zhiyong2,3,4; Dai, Guyue2; Wang, Bin5; Xiong, Ying6; Zheng, Huinan2,3; Cui, Jun1; Wang, Yuming2,3

2022-05-16

10.1029/2022GL098810

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

Earth's radiation belt relativistic electron dropouts frequently occur during the main phase of geomagnetic storms, which have been partially attributed to the ring current ion enhancements causing geomagnetic field reconfigurations. In contrast to early studies on the global radiation belt response to the ring current buildup on a timescale of several hours, we here describe a rapid, localized, significant decay of relativistic electrons driven by freshly injected energetic protons during the 27 May 2017 geomagnetic storm. Near the proton injection front, the magnetic field lines were stretched outward, with an inferred migration of their equatorial crossings by similar to 0.5 R-E during several minutes. Because of the betatron and Fermi decelerations, the relativistic electron fluxes decreased by 2-3 orders of magnitude with pitch-angle distributions evolving from pancake/flat-top type to cigar type. This rapid localized response pattern of relativistic electrons could be general over strong particle injections during both geomagnetic storms and substorms.

radiation belt ring current substorm injection adiabatic transport betatron deceleration Fermi deceleration

SCI ; EI

英语

其他

National Natural Science Foundation of China[42188101,42004140,42174185] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; Chinese Academy of Sciences["KZCX2-EW-QN510","KZZD-EW-01-4"] ; CAS Key Research Program of Frontier Sciences[QYZDB-SSW-DQC015] ; Key Research Program of the Chinese Academy of Sciences[ZDRE-KT-2021-3]

Geology

Geosciences, Multidisciplinary

WOS:000797413700003

AMER GEOPHYSICAL UNION

20222012123950

Betatrons ; Electrons ; Geomagnetism ; Storms

Precipitation:443.3 ; Earth Magnetism and Terrestrial Electricity:481.3.2 ; Particle Accelerators:932.1.1

GEOSCIENCES

Web of Science

1.Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai, Peoples R China
2.Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei, Peoples R China
3.Univ Sci & Technol China, Collaborat Innovat Ctr Astronaut Sci & Technol, Hefei, Peoples R China
4.Univ Sci & Technol China, Sch Earth & Space Sci, Mengcheng Natl Geophys Observ, Hefei, Peoples R China
5.Beijing Inst Tracing & Telecommun Technol, Beijing, Peoples R China
6.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Chen, Zewen,Su, Zhenpeng,He, Zhaoguo,et al. A Rapid Localized Deceleration of Earth's Radiation Belt Relativistic Electrons Driven by Storm Proton Injection[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(9).

Chen, Zewen.,Su, Zhenpeng.,He, Zhaoguo.,Wu, Zhiyong.,Dai, Guyue.,...&Wang, Yuming.(2022).A Rapid Localized Deceleration of Earth's Radiation Belt Relativistic Electrons Driven by Storm Proton Injection.GEOPHYSICAL RESEARCH LETTERS,49(9).

Chen, Zewen,et al."A Rapid Localized Deceleration of Earth's Radiation Belt Relativistic Electrons Driven by Storm Proton Injection".GEOPHYSICAL RESEARCH LETTERS 49.9(2022).