Ultralow frequency waves in the South Atlantic anomaly:Application of FY-3E observations  

作　　者：Li LI Qiugang ZONG Xuzhi ZHOU Ying LIU Robert RANKIN Shan WANG Yongfu WANG Xiangqian YU Jie REN Zikang XIE Hong ZOU Yuguang YE Chao YUE 

机构地区：[1]School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]State Key Laboratory of Lunar and Planetary Science,Macao University of Science and Technology,Macao 999078,China [3]Department of Physics,University of Alberta,Edmonton AB T6G 2G7,Canada [4]School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China

出　　处：《Science China Earth Sciences》2025年第3期943-952,共10页中国科学(地球科学英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 42204167, 42174184 and 41974191);the National Key Research and Development Program of China (2021YFA0718600);the Informatization Plan of Chinese Academy of Sciences (Grant No. CAS-WX2022SF-0103);financial support from the Canadian Space Agency。

摘　　要：On 5 July 2021, the China FY-3E satellite was successfully launched, equipped with instruments to measure ultralow frequency waves(ULF) and charged particle populations deep within the magnetosphere. In this study, we report two ULF wave events observed by the FY-3E satellite, which are closely associated with magnetospheric substorms, in conjunction with observations from the Swarm satellite. We noticed a significant similarity between the ULF waves recorded by FY-3E and Swarm, indicating that these satellites captured the same wave events. The presence of a 180° phase shift across L shells and an oscillating field aligned Poynting flux suggest that the observed ULF waves exhibit characteristics of field line resonance(FLR).This work also characterizes essential differences in the behavior of ULF pulsations affected by the South Atlantic anomaly(SAA) in comparison to a conjugate region outside. Wave packets in the SAA region exhibit higher amplitudes than the pulsations in the northern hemisphere. This difference is likely influenced by the north-south asymmetry of the geomagnetic field and ionospheric conductivities, which, in turn, control the standing wave structure along the field line.

关 键 词：ULF waves SAA FY-3E SWARM north-south asymmetry 

分 类 号：P31[天文地球—固体地球物理学]