GECAM Discovery of Peculiar Oscillating Particle Precipitation Events
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| Format: | Preprint |
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2025
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| author | Wang, Chenwei Xiong, Shaolin Zhao, Yi Xu, Wei Lu, Gaopeng Zhou, Xuzhi Guo, Xiaocheng Li, Wenya Yang, Xiaochao Zhang, Qinghe Li, Xinqiao Zhang, Zhenxia An, Zhenghua Cai, Ce Feng, Peiyi Huang, Yue Gao, Min Gong, Ke Guo, Dongya Guo, Haoxuan Li, Bing Li, Xiaobo Liu, Yaqing Liu, Jiacong Liu, Xiaojing Ma, Xiang Peng, Wenxi Qiao, Rui Ren, Yangzhao Song, Liming Tan, Wenjun Wang, Jin Wang, Jinzhou Wang, Ping Wang, Yue Wen, Xiangyang Xiao, Shuo Xie, Shenlun Xu, Yanbing Xue, Wangchen Yang, Sheng Yi, Qibin Yu, Zhenghang Zhang, Dali Zhang, Fan Zhang, Jinpeng Zhang, Peng Zhang, Wenlong Zhang, Yanqiu Zhang, Shuangnan Zhang, Zhen Zhao, Haisheng Zhao, Xiaoyun Zheng, Chao Zheng, Shijie |
| author_facet | Wang, Chenwei Xiong, Shaolin Zhao, Yi Xu, Wei Lu, Gaopeng Zhou, Xuzhi Guo, Xiaocheng Li, Wenya Yang, Xiaochao Zhang, Qinghe Li, Xinqiao Zhang, Zhenxia An, Zhenghua Cai, Ce Feng, Peiyi Huang, Yue Gao, Min Gong, Ke Guo, Dongya Guo, Haoxuan Li, Bing Li, Xiaobo Liu, Yaqing Liu, Jiacong Liu, Xiaojing Ma, Xiang Peng, Wenxi Qiao, Rui Ren, Yangzhao Song, Liming Tan, Wenjun Wang, Jin Wang, Jinzhou Wang, Ping Wang, Yue Wen, Xiangyang Xiao, Shuo Xie, Shenlun Xu, Yanbing Xue, Wangchen Yang, Sheng Yi, Qibin Yu, Zhenghang Zhang, Dali Zhang, Fan Zhang, Jinpeng Zhang, Peng Zhang, Wenlong Zhang, Yanqiu Zhang, Shuangnan Zhang, Zhen Zhao, Haisheng Zhao, Xiaoyun Zheng, Chao Zheng, Shijie |
| contents | Charged particle precipitation typically manifests as a gradual increase and decrease of flux observed by space detectors. Cases with rapidly flux variation are very rare. Periodic events are even more extraordinary. These oscillating particle precipitation (OPP) events are usually attributed to the bounce motion of electrons, which are induced by lightning. Owing to the observation limitations, there has been debate regarding whether these oscillations originate from temporal flux evolution or spatial structure evolution. Here we report three peculiar charged particle precipitation events detected by GECAM during a geomagnetic storm on March 21, 2024, with two exhibiting significant periodicity. These events were observed around the same region during three consecutive orbits. Through comprehensive temporal and spectral analyses, we revealed that one of the OPP events exhibited a transition in spectral lag of mini-pulses, shifting from "softer-earlier" to "softer-later" while showing no significant time evolution in overall frequency characteristics. And there is no association found between these two OPP events and lightning activity. Several possible scenarios are discussed to explain these charged particles with a life time of more than 3.5 hours, but the nature of these three events remains an enigma. We suggest that these GECAM-detected OPP events may represent a new type of particle precipitation event or a peculiar Lightning-induced Electron Precipitations (LEPs). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06192 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | GECAM Discovery of Peculiar Oscillating Particle Precipitation Events Wang, Chenwei Xiong, Shaolin Zhao, Yi Xu, Wei Lu, Gaopeng Zhou, Xuzhi Guo, Xiaocheng Li, Wenya Yang, Xiaochao Zhang, Qinghe Li, Xinqiao Zhang, Zhenxia An, Zhenghua Cai, Ce Feng, Peiyi Huang, Yue Gao, Min Gong, Ke Guo, Dongya Guo, Haoxuan Li, Bing Li, Xiaobo Liu, Yaqing Liu, Jiacong Liu, Xiaojing Ma, Xiang Peng, Wenxi Qiao, Rui Ren, Yangzhao Song, Liming Tan, Wenjun Wang, Jin Wang, Jinzhou Wang, Ping Wang, Yue Wen, Xiangyang Xiao, Shuo Xie, Shenlun Xu, Yanbing Xue, Wangchen Yang, Sheng Yi, Qibin Yu, Zhenghang Zhang, Dali Zhang, Fan Zhang, Jinpeng Zhang, Peng Zhang, Wenlong Zhang, Yanqiu Zhang, Shuangnan Zhang, Zhen Zhao, Haisheng Zhao, Xiaoyun Zheng, Chao Zheng, Shijie High Energy Astrophysical Phenomena Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Space Physics Charged particle precipitation typically manifests as a gradual increase and decrease of flux observed by space detectors. Cases with rapidly flux variation are very rare. Periodic events are even more extraordinary. These oscillating particle precipitation (OPP) events are usually attributed to the bounce motion of electrons, which are induced by lightning. Owing to the observation limitations, there has been debate regarding whether these oscillations originate from temporal flux evolution or spatial structure evolution. Here we report three peculiar charged particle precipitation events detected by GECAM during a geomagnetic storm on March 21, 2024, with two exhibiting significant periodicity. These events were observed around the same region during three consecutive orbits. Through comprehensive temporal and spectral analyses, we revealed that one of the OPP events exhibited a transition in spectral lag of mini-pulses, shifting from "softer-earlier" to "softer-later" while showing no significant time evolution in overall frequency characteristics. And there is no association found between these two OPP events and lightning activity. Several possible scenarios are discussed to explain these charged particles with a life time of more than 3.5 hours, but the nature of these three events remains an enigma. We suggest that these GECAM-detected OPP events may represent a new type of particle precipitation event or a peculiar Lightning-induced Electron Precipitations (LEPs). |
| title | GECAM Discovery of Peculiar Oscillating Particle Precipitation Events |
| topic | High Energy Astrophysical Phenomena Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Space Physics |
| url | https://arxiv.org/abs/2505.06192 |