Van Allen Probes Observations of Oxygen Ion Cyclotron Harmonic Waves: Statistical Study

Wang, Yan1; Liu, Kaijun1; Min, Kyungguk2; Yao, Fei1; Xiong, Ying1; Cheng, Kun1; Liu, Yuqi1; Zheng, Xianming1; Zhou, Jingyi1

2022-02-28

10.1029/2021GL096825

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

We report the first statistical survey of the oxygen ion cyclotron harmonic waves observed by Van Allen Probes throughout the mission. Our statistical study shows that the waves occurred over 2 L < 6 and across all magnetic local time. More than 50% of the events were observed just outside the plasmapause, and the typical wave amplitude is between similar to 0.1 and several nT. The frequency spacing between two consecutive wave harmonics decreases with increasing L but stabilizes when L > 5. The frequency spacing is larger than the local oxygen ion gyrofrequency for many events, especially those observed at larger L, suggesting that these waves propagated there from lower L shell regions. The waves are mainly on the dayside at L > 4 under quiet geomagnetic conditions, but can occur at lower L shells with a more uniform MLT distribution under more active geomagnetic conditions.

oxygen ion cyclotron harmonic waves Van Allen Probes ring current ions radiation belt

SCI ; EI

英语

第一 ; 通讯

Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; NSFC[41974168] ; Shenzhen Science and Technology Program[JCYJ20190809153407516] ; National Research Foundation of Korea (NRF) - Korea government (MSIT)[2020R1C1C1009996]

Geology

Geosciences, Multidisciplinary

WOS:000765659300026

AMER GEOPHYSICAL UNION

20221111770631

Cyclotrons ; Geomagnetism ; Harmonic analysis ; Ions ; Oxygen ; Radiation belts ; Statistics

Earth Magnetism and Terrestrial Electricity:481.3.2 ; Chemical Products Generally:804 ; Numerical Methods:921.6 ; Mathematical Statistics:922.2 ; Particle Accelerators:932.1.1

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon, South Korea

Wang, Yan,Liu, Kaijun,Min, Kyungguk,et al. Van Allen Probes Observations of Oxygen Ion Cyclotron Harmonic Waves: Statistical Study[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(4).

Wang, Yan.,Liu, Kaijun.,Min, Kyungguk.,Yao, Fei.,Xiong, Ying.,...&Zhou, Jingyi.(2022).Van Allen Probes Observations of Oxygen Ion Cyclotron Harmonic Waves: Statistical Study.GEOPHYSICAL RESEARCH LETTERS,49(4).

Wang, Yan,et al."Van Allen Probes Observations of Oxygen Ion Cyclotron Harmonic Waves: Statistical Study".GEOPHYSICAL RESEARCH LETTERS 49.4(2022).