Observations of Forbush Decreases of Cosmic-Ray Electrons and Positrons with the Dark Matter Particle Explorer
Authors: Alemanno Francesca , An Qi , Azzarello Philipp , Carla Tiziana Barbato Felicia , Bernardini Paolo , Bi XiaoJun , Cai MingSheng , Casilli Elisabetta , Catanzani Enrico , Chang Jin , Chen DengYi , Chen JunLing , Chen ZhanFang , Cui MingYang , Cui TianShu , Cui YuXing , Dai HaoTing , De Benedittis Antonio , De Mitri Ivan , de Palma Francesco , Deliyergiyev Maksym , Di Santo Margherita , Ding Qi , Dong TieKuang , Dong ZhenXing , Donvito Giacinto , Droz David , Duan JingLai , Duan KaiKai , D’Urso Domenico , Fan RuiRui , Fan YiZhong , Fang Fang , Fang Kun , Feng ChangQing , Feng Lei , Fusco Piergiorgio , Gao Min , Gargano Fabio , Gong Ke , Gong YiZhong , Guo DongYa , Guo JianHua , Han ShuangXue , Hu YiMing , Huang GuangShun , Huang XiaoYuan , Huang YongYi , Ionica Maria , Jiang Wei , Kong Jie , Kotenko Andrii , Kyratzis Dimitrios , Li S. , Lei ShiJun , Li WenHao , Li WeiLiang , Li Xiang , Li XianQiang , Liang YaoMing , Liu ChengMing , Liu Hao , Liu Jie , Liu ShuBin , Liu Yang , Loparco Francesco , Luo ChuanNing , Ma Miao , Ma PengXiong , Ma Tao , Ma XiaoYong , Marsella Giovanni , Mazziotta Mario Nicola , Mo Dan , Niu XiaoYang , Pan Xu , Parenti Andrea , Peng WenXi , Peng XiaoYan , Perrina Chiara , Qiao Rui , Rao JiaNing , Ruina Arshia , Salinas MariaMunoz , Shangguan Zhi , Shen WeiHua , Shen ZhaoQiang , Shen ZhongTao , Silveri Leandro , Song JingXing , Stolpovskiy Mikhail , Su Hong , Su Meng , Sun HaoRan , Sun ZhiYu , Surdo Antonio , Teng XueJian , Tykhonov Andrii , Wang JinZhou , Wang LianGuo , Wang Shen , Wang ShuXin , Wang XiaoLian , Wang Ying , Wang YanFang , Wang YuanZhu , Wei DaMing , Wei JiaJu , Wei YiFeng , Wu Di , Wu Jian , Wu LiBo , Wu Sha Sha , Wu Xin , Xia ZiQing , Xu EnHeng , Xu HaiTao , Xu ZhiHui , Xu ZunLei , Xue GuoFeng , Xu ZiZong , Yang HaiBo , Yang Peng , Yang YaQing , Jun Yao Hui , Yu YuHong , Yuan GuanWen , Yuan Qiang , Yue Chuan , Zang JingJing , Zhang ShengXia , Zhang WenZhang , Zhang Yan , Zhang Yi , Zhang YongJie , Zhang YunLong , Zhang YaPeng , Zhang YongQiang , Zhang ZhiYong , Zhang Zhe , Zhao Cong , Zhao HongYun , Zhao XunFeng , Zhou ChangYi , Zhu Yan ,   (DAMPE Collaboration), Chen Wei , Feng Li , Luo Xi , Zhu ChengRui 
Published: October 2021

Abstract
The Forbush decrease (FD) represents the rapid decrease of the intensities of charged particles accompanied with the coronal mass ejections or high-speed streams from coronal holes. It has been mainly explored with the ground-based neutron monitor network, which indirectly measures the integrated intensities of all species of cosmic rays by counting secondary neutrons produced from interaction between atmospheric atoms and cosmic rays. The space-based experiments can resolve the species of particles but the energy ranges are limited by the relatively small acceptances except for the most abundant particles like protons and helium. Therefore, the FD of cosmic-ray electrons and positrons have just been investigated by the PAMELA experiment in the low-energy range (<5 GeV) with limited statistics. In this paper, we study the FD event that occurred in 2017 September with the electron and positron data recorded by the Dark Matter Particle Explorer. The evolution of the FDs from 2 GeV to 20 GeV with a time resolution of 6 hr are given. We observe two solar energetic particle events in the time profile of the intensity of cosmic rays, the earlier, and weaker, one has not been shown in the neutron monitor data. Furthermore, both the amplitude and recovery time of fluxes of electrons and positrons show clear energy dependence, which is important in probing the disturbances of the interplanetary environment by the coronal mass ejections.