气候变化领域集成服务门户(CCPortal): The Modulation of Plasma and Waves by Background Electron Density Irregularities in the Inner Magnetosphere

CCPortal

DOI	10.1029/2020GL088855
	The Modulation of Plasma and Waves by Background Electron Density Irregularities in the Inner Magnetosphere
	Yue C.; Ma Q.; Jun C.-W.; Bortnik J.; Zong Q.; Zhou X.; Jang E.; Reeves G.D.; Spence H.E.; Wygant J.R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	The background cold electron density plays an important role in plasma and wave dynamics. Here, we investigate an event with clear modulation of the particle fluxes and wave intensities by background electron density irregularities based on Van Allen Probes observations. The energies at the peak fluxes of protons and Helium ions of 100 eV to several keV are well correlated with the total electron density variation. Intense electromagnetic ion cyclotron (EMIC) and magnetosonic (MS) waves are simultaneously observed in the high-density regions and disappear in low-density regions. Based on the linear theory of wave growth, the EMIC waves are generated by the ~10 keV protons, while most MS waves are generated by the positive gradient of proton phase space density at several hundred eV in the high-density regions. Our results indicate the importance of background plasma density structures in generation of plasma waves by unstable ion distributions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electron density measurement; Ions; Magnetosphere; Modulation; Phase space methods; Plasma density; Density structures; Density variations; Electron density irregularities; High density regions; Inner magnetosphere; Ion distributions; Phase space densities; Wave intensities; Electrons; electromagnetic wave; electron; electron density; helium; ion exchange; magnetosphere; plasma; probe; wave dispersion
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170048
作者单位	Institute of Space Physics and Applied Technology, Peking University, Beijing, China; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Center for Space Physics, Boston University, Boston, MA, United States; Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan; Space Science and Applications Group, Los Alamos National Laboratory, Los Alamos, NM, United States; Space Sciences Division, New Mexico Consortium, Los Alamos, NM, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States
推荐引用方式 GB/T 7714	Yue C.,Ma Q.,Jun C.-W.,et al. The Modulation of Plasma and Waves by Background Electron Density Irregularities in the Inner Magnetosphere[J],2020,47(15).
APA	Yue C..,Ma Q..,Jun C.-W..,Bortnik J..,Zong Q..,...&Wygant J.R..(2020).The Modulation of Plasma and Waves by Background Electron Density Irregularities in the Inner Magnetosphere.Geophysical Research Letters,47(15).
MLA	Yue C.,et al."The Modulation of Plasma and Waves by Background Electron Density Irregularities in the Inner Magnetosphere".Geophysical Research Letters 47.15(2020).