Article
Geosciences, Multidisciplinary
Veronika S. Grach, Anton Artemyev, Andrei G. Demekhov, Xiao-Jia Zhang, Jacob Bortnik, Vassilis Angelopoulos, Rumi Nakamura, Ethan Tsai, Colin Wilkins, Owen W. Roberts
Summary: This study investigates the transport effects of intense electromagnetic ion cyclotron (EMIC) waves on relativistic electron precipitation. Despite the transport of low pitch-angle electrons away from the loss cone, scattering at higher pitch angles results in the loss cone filling and electron precipitation.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jacob Bortnik, Jay M. Albert, Anton Artemyev, Wen Li, Chae-Woo Jun, Veronika S. Grach, Andrei G. Demekhov
Summary: Recent work has found that EMIC waves occur in four distinct regions, each with their own characteristics and morphology. Nonlinear test-particle simulations were used to study the range of energetic electron scattering responses to two groups of EMIC waves occurring at low L-shells and overlapping with outer radiation belt electrons. The results show that high-density EMIC waves can drive a range of linear and nonlinear behaviors, contradicting conventional expectations and potentially having profound implications for observational campaigns.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Xingzhi Lyu, Qianli Ma, Weichao Tu, Wen Li, Luisa Capannolo
Summary: This study quantitatively investigates the effects of electromagnetic ion cyclotron (EMIC) waves on the simultaneous dropout of both electron and proton plasma populations. By modeling and analyzing the observations from February 27, 2014, the researchers were able to accurately reproduce the concurrent dropout of energetic electrons and protons.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
Hyomin Kim, Quintin Schiller, Mark J. Engebretson, Sungjun Noh, Ilya Kuzichev, Louis J. Lanzerotti, Andrew J. Gerrard, Khan-Hyuk Kim, Marc R. Lessard, Harlan E. Spence, Dae-Young Lee, Juergen Matzka, Tanja Fromm
Summary: Observations of electromagnetic ion cyclotron (EMIC) waves and their interactions with high energy particles were conducted using the twin Van Allen Probes spacecraft. Analysis of particle data and ground-based magnetometer observations showed a significant energy-dependent relativistic electron dropout over a limited L-shell range during and after the EMIC wave activity. NOAA spacecraft also observed relativistic electron precipitation associated with the EMIC waves near the footprint of Van Allen Probes.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
S. Teng, N. Liu, Q. Ma, X. Tao, W. Li
Summary: This study demonstrates that ring-like proton distributions can generate both magnetosonic (MS) waves and electromagnetic ion cyclotron (EMIC) waves, providing direct observational evidence for previous theoretical predictions. By comparing linear growth rates and proton distribution evolution, the study reveals the generation mechanisms and relationship between these waves.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
S. Nakamura, Y. Miyoshi, K. Shiokawa, Y. Omura, T. Mitani, T. Takashima, N. Higashio, I Shinohara, T. Hori, S. Imajo, A. Matsuoka, F. Tsuchiya, A. Kumamoto, Y. Kasahara, M. Shoji, H. Spence, V Angelopoulos
Summary: The study observed rapid flux depressions in relativistic electrons, known as EMIC-induced drifting electron holes (EDEHs), caused by electromagnetic ion cyclotron waves on a short timescale in a limited region. These flux depressions occur in the relativistic energy range and small pitch angles, potentially leading to significant depression of the radiation belt.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
L. Capannolo, W. Li, H. Spence, A. T. Johnson, M. Shumko, J. Sample, D. Klumpar
Summary: By analyzing coordinated multisatellite observations, this study found that electron precipitation driven by EMIC waves occurs in a broad region near dusk, mostly confined to 3.5-7.5 L-shells, with each precipitation event occurring on localized radial scales. The data from FIREBIRD-II suggest that EMIC waves can efficiently scatter electron energies from around 200 to 300 keV up to the expected MeV energies.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Multidisciplinary
Yang Chang, Wang ZongQiang, Xiao FuLiang, He ZhaoGuo, Xie YanQiong, Zhang Sai, He YiHua, Liu Si, Zhou QingHua
Summary: During the geomagnetic storm in September 2015, the Van Allen Probes observed enhanced EMIC waves, a decrease in fluxes of tens of keV protons, and a significant increase in precipitating protons at ionospheric altitudes.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Astronomy & Astrophysics
Dae-Young Lee
Summary: This study explores the precipitation loss rates of 5 MeV electrons with initial pitch angles of 4-10 degrees caused by He+ band EMIC waves, finding a strong dependence of the loss rates on wave frequency with a maximum loss frequency.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Asuka Hirai, Fuminori Tsuchiya, Takahiro Obara, Yuto Katoh, Yoshizumi Miyoshi, Kazuo Shiokawa, Yasumasa Kasaba, Hiroaki Misawa, Chae-Woo Jun, Satoshi Kurita, Martin G. G. Connors, Aaron T. T. Hendry, Atsuki Shinbori, Yuichi Otsuka, Takuya Tsugawa, Michi Nishioka, Septi Perwitasari, Jerry W. W. Manweiler
Summary: By analyzing ground and satellite observations of EMIC waves, researchers found that the increased frequency of intervals of pulsations of diminishing periods (IPDPs) is caused by an inward shift of the EMIC wave source region, which is influenced by the enhanced convection electric field. This inward shift allows EMIC waves to scatter relativistic electrons over a wide range of radial distances during IPDP events. The study also suggests a possible contribution of EMIC waves to outer radiation belt loss during the main phase of geomagnetic storms.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Geosciences, Multidisciplinary
S. S. Elliott, A. W. Breneman, C. Colpitts, J. M. Pettit, C. A. Cattell, A. J. Halford, M. Shumko, J. Sample, A. T. Johnson, Y. Miyoshi, Y. Kasahara, C. M. Cully, S. Nakamura, T. Mitani, T. Hori, I. Shinohara, K. Shiokawa, S. Matsuda, M. Connors, M. Ozaki, J. Manninen
Summary: Microbursts are rapid injections of electrons into the atmosphere, and they are believed to be caused by nonlinear scattering by chorus waves. However, uncertainty regarding the size and duration of microburst regions makes it difficult to determine their contribution to outer belt electron loss. By combining multiple datasets, this study estimates the size of the microburst-producing chorus source region and suggests that microbursts likely play a major role in outer radiation belt electron loss for this event.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Xing Cao, Peng Lu, Binbin Ni, Danny Summers, Yuri Y. Shprits, Minyi Long, Xiaoyu Wang
Summary: By constructing an empirical model based on Cassini datasets, this study investigates the resonant interactions between ion cyclotron waves and radiation belt electrons at Saturn. It is found that the ion cyclotron waves can efficiently scatter high-energy electrons into the loss cone, inducing precipitation loss. The electron loss timescales decrease significantly with increasing L-shell and the presence of pick-up ring particles can affect the pitch angle scattering efficiency for lower energy electrons.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Benjamin Hogan, Xinlin Li, Zheng Xiang, Hong Zhao, Yang Mei, Declan O'Brien, Daniel N. Baker, Shrikanth Kanekal
Summary: Understanding local loss processes in Earth's radiation belts is crucial for understanding their overall structure. Recent research suggests that electromagnetic ion cyclotron waves may contribute to the rapid loss of multi-MeV electrons, especially near L* = 3.5. Analysis shows the occurrence of EMIC waves at higher L* values. These findings enhance our understanding of the radiation belt dynamics.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Lunjin Chen, Xiao-Jia Zhang, Anton Artemyev, Vassilis Angelopoulos, Ethan Tsai, Colin Wilkins, Richard B. Horne
Summary: During magnetospheric storms, energetic electron microbursts are observed. It is found that these microbursts may be caused by ducted whistler-mode lower-band chorus waves.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
Geng Wang, ZhongLei Gao, MingYu Wu, GuoQiang Wang, SuDong Xiao, YuanQiang Chen, ZhengYang Zou, TieLong Zhang
Summary: The existence of intense unguided L-mode EMIC waves in the radiation belt was demonstrated for the first time based on polarization characteristics. Hot protons may provide free energy for wave growth, and the spatial locations of local helium cutoff frequencies can lead to the trapping and significant amplification of the unguided mode waves. These findings contribute to understanding the nature of EMIC waves and their dynamics in the radiation belt.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Quanhao Zhang, Xin Cheng, Rui Liu, Anchuan Song, Xiaolei Li, Yuming Wang
Summary: In this paper, numerical simulations were conducted to investigate the evolution of coronal magnetic rope systems under the ideal magnetohydrodynamic (MHD) and resistive conditions. It was found that under the ideal MHD condition, only certain photospheric flux distributions could lead to catastrophic eruptions in the flux rope system, while under the resistive condition, eruptions could still occur even if the photospheric flux distributions did not meet the catastrophic condition.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
YuMing Wang, TieLong Zhang, GuoQiang Wang, SuDong Xiao, ZhuXuan Zou, Long Cheng, ZongHao Pan, Kai Liu, XinJun Hao, YiRen Li, ManMing Chen, ZhouBin Zhang, Wei Yan, ZhenPeng Su, ZhiYong Wu, ChengLong Shen, YuTian Chi, MengJiao Xu, JingNan Guo, Yang Du
Summary: The Mars Orbiter MAGnetometer (MOMAG) is a scientific instrument on China's Tianwen-1 mission, recording magnetic field data around Mars. It shows similar magnetic structures and magnitudes as NASA's MAVEN mission, with 158 clear bow shock crossings matching the modeled average. Comparing datasets from Tianwen-1 and MAVEN confirms the global shape and south-north asymmetry of the Martian bow shock. MOMAG performs well, providing accurate magnetic field vectors, and its data complements MAVEN to enhance our understanding of the plasma environment of Mars.
EARTH AND PLANETARY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Shaoyu Lyu, Yuming Wang, Xiaolei Li, Quanhao Zhang
Summary: In this study, the CORAR technique was applied to reconstruct images from the COR-2 coronagraphs on board STEREO, and the impact of theta(Sun) on the reconstruction of coronal transients was explored. The optimal theta(Sun) for reconstruction was determined to be around 135 degrees. The findings provide valuable insights for future missions with multiple perspective coronagraphs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Ruobing Zheng, Yuming Wang, Xiaolei Li, Chuanbing Wang, Xianzhe Jia
Summary: We conducted a statistical study of Jovian decametric (DAM) radio emissions using observations from the Wind and STEREO spacecraft. By analyzing 81 isolated, strong events from 2008 to 2014, we were able to determine the rotation speed and occurrence probability of Io-related and non-Io-related DAM emissions. We also located the sources of DAM events and inferred their emission angles and electron energy.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Xiaolei Li, Yuming Wang, Fang Shen, Yi Yang, Quanhao Zhang, Shaoyu Lyu
Summary: We developed a correlation-aided reconstruction method to recognize and locate solar wind transients observed by the Heliospheric Imager-1 (HI1) and inferred their radial velocity distribution. By applying this method to small-scale transients in a complete Carrington rotation, we successfully reconstructed a synoptic map of the solar wind radial velocity. Our test suggests that the reconstructed synoptic map matches the preset synthetic transients in terms of latitude, longitude, and radial velocity.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Zhenpeng Su, Yuming Wang, Tielong Zhang, Zhiyong Wu, Long Cheng, Zhuxuan Zou, Chenglong Shen, Jingnan Guo, Sudong Xiao, Guoqiang Wang, Zonghao Pan, Kai Liu, Xinjun Hao, Yiren Li, Manming Chen, Yutian Chi, Mengjiao Xu
Summary: We present the first observation of significant modifications by a solar wind stream interaction region to the Martian foreshock waves, which are an important energy dissipation product of the bow shock.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Engineering, Multidisciplinary
Xu Shan, Bin Miao, Zhe Cao, ZhenYu Sun, YiRen Li, Kai Liu, XingYu Guo, SanBiao Qu, ZhenPeng Su, ChengLong Shen, ZongHao Pan, Xin Li, XinJun Hao, XiaoPing Yang, Chao Tian, Yu Jiang, ShuBin Liu, Qi An, XiangJun Chen, YuMing Wang
Summary: On June 23, 2020, a Chinese geosynchronous satellite was launched, which carried a plasma detection package to monitor the space environment. The low energy ion spectrometer (LEIS), one of the primary instruments in the package, demonstrated three-dimensional measurement of ions in space with a large field of view and wide energy range. The observations revealed clear signatures of surface charging and storm/substorm ion injections, providing valuable insights into the space ion environment and aiding in space weather forecasting.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Astronomy & Astrophysics
Tingyu Gou, Rui Liu, Astrid M. Veronig, Bin Zhuang, Ting Li, Wensi Wang, Mengjiao Xu, Yuming Wang
Summary: An observed magnetic flux rope builds and erupts by completely restructuring its magnetic field lines, resulting in marked footpoint migration. This configuration is not predicted by standard flux rope evolution models, highlighting the three-dimensional nature of magnetic reconnection behind these phenomena.
Article
Physics, Multidisciplinary
Zhenjun Zhou, Chaowei Jiang, Xiaoyu Yu, Yuming Wang, Yongqiang Hao, Jun Cui
Summary: Solar eruptions display rotation of filaments, which can be caused by either external shear-field torque or internal magnetic twist relaxation. It is difficult to determine the dominant contribution from direct observations. In this study, a full MHD simulation of solar eruption was used to investigate the mechanism of magnetic flux rope rotation. The simulation suggests that the external shear-field torque plays a major role in the counterclockwise rotation, while the Lorentz torque inside the flux rope has a negative effect on it.
FRONTIERS IN PHYSICS
(2023)
Article
Engineering, Aerospace
Jilin You, Xiaoping Zhang, Hsinchen Yu, Haiyan Zhang, Cunhui Li, Roberto Bugiolacchi, Yi Xu, Yi Wang, Pengwei Luo, Liping Chen, Baogui Zhang, Yingqiao Xu, Yongfu Hu, Tong Wang, Yuming Wang, Qingfei Fu, Yupeng Gao, Weidong Wang, Qijun Zhi, Linping Feng, Haiwen Liu, Yifei Cui, Jiayan Nie
Summary: During landing, the plume erodes the lunar surface, affecting its nature. Landing also allows for the study of wind erosion on airless bodies like the Moon and extracting mechanical properties of lunar regolith. This study aims to quantify interparticle force, erosion depth, and other parameters, test plume erosion model reliability, and provide reference information for scientific interpretations of returned samples. The results show the erosion depth, total mass of regolith mobilized, and a new formula to calculate the threshold friction velocity for plume erosion initiation.
Correction
Astronomy & Astrophysics
Wageesh Mishra, Yuming Wang, Shaoyu Lyu, Soumyaranjan Khuntia
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yutian Chi, Chenglong Shen, Junyan Liu, Zhihui Zhong, Mathew Owens, Christopher Scott, Luke Barnard, Bingkun Yu, Daniel Heyner, Hans-Ulrich Auster, Ingo Richter, Yuming Wang, Tielong Zhang, Jingnan Guo, Beatriz Sanchez-Cano, Zonghao Pan, Zhuxuan Zou, Mengjiao Xu, Long Cheng, Zhenpeng Su, Dongwei Mao, Zhiyong Zhang, Can Wang, Zhiyong Wu, Guoqiang Wang, Sudong Xiao, Kai Liu, Xinjun Hao, Yiren Li, Manming Chen, Mike Lockwood
Summary: This study reports two multipoint interplanetary coronal mass ejections (ICMEs) detected by the Tianwen-1 and Mars Atmosphere and Volatile Evolution spacecraft at Mars, and the BepiColombo spacecraft upstream of Mars. The findings highlight the importance of background solar wind in determining the interplanetary evolution and global morphology of ICMEs up to Mars distance. Observations from multiple locations are invaluable for space weather studies at Mars and merit more exploration in the future.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Yutian Chi, Chenglong Shen, Long Cheng, Bingkun Yu, Bin Miao, Yuming Wang, Tielong Zhang, Zhuxuan Zou, Mengjiao Xu, Zonghao Pan, Zhenpeng Su, Jingnan Guo, Dongwei Mao, Zhihui Zhong, Zhiyong Zhang, Junyan Liu, Can Wang, Zhiyong Wu, Guoqiang Wang, Sudong Xiao, Kai Liu, Xinjun Hao, Yiren Li, Manming Chen, Yang Du
Summary: The Tianwen-1 spacecraft is China's first Mars exploration mission. The Mars Orbiter Magnetometer (MOMAG) on board Tianwen-1 is used to study magnetic fields at Mars. By comparing data from Tianwen-1/MOMAG and MAVEN/MAG, it was found that they have good consistency in measuring the magnetic field intensity and vector magnetic field during the interplanetary coronal mass ejection (ICME) and stream interaction region (SIR) interval. The MOMAG instrument on Tianwen-1 is almost unique in monitoring the interplanetary magnetic field currently at Mars.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Xu Shan, Bin Miao, Zhe Cao, Zhenyu Sun, Yiren Li, Kai Liu, Sanbiao Qu, Xingyu Guo, Zhenpeng Su, Chenglong Shen, Zonghao Pan, Xin Li, Xinjun Hao, Xiaoping Yang, Chao Tian, Yu Jiang, Shubin Liu, Qi An, Xiangjun Chen, Yuming Wang
Summary: A low-energy ion spectrometer (LEIS) on a Chinese navigation satellite can detect plasma using a top-hat electrostatic analyzer and angular scanning deflectors. It can measure energetic ions in 3D space with a wide field of view and energy range. Performance parameters such as geometric factor, resolution, and linear relations between angles and voltages have been determined through simulations and experiments, and the LEIS has been shown to meet mission requirements.