Collaborative Research: GEM--Thermal Electron Anisotropy in the Earth&#39;s Magnetotail

GSTDTAP

项目编号	1902684
	Collaborative Research: GEM--Thermal Electron Anisotropy in the Earth's Magnetotail
	IVAN VASKO (Principal Investigator)
主持机构	University of California-Berkeley
项目开始年	2019
	2019-06-01
项目结束日期	2022-05-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	209973(USD)
国家	美国
语种	英语
英文摘要	One of the most important problems of space plasma physics is understanding how high-energy charged particles are generated. There are a huge variety of mechanisms suggested for accelerating electrons in the region of the geomagnetic field known as the current sheet. This project will help distinguish between these theories to help determine which are at work in the magnetosphere. This is directly relevant to the National Space Weather Plan, since the work can lead to better models and forecasts of space weather, which affects national commercial and defense satellites and space-based communications. Additionally, graduate and undergraduate students will participate in the research. This project quantifies the impact of the electron thermal anisotropy on the magnetotail current sheet structure and investigates the variation of characteristics of electron thermal anisotropy with geomagnetic activity. The anisotropic electron population can be responsible for generation of strong currents (induced by particle curvature drifts) and can serve as an energy source for various electromagnetic wave emissions. The project uses observations from five spacecraft missions (Geotail, Cluster, THEMIS, ARTEMIS, and MMS) covering the entire magnetotail within the radial distances from 10 to 80 Earth radii downtail. Using several years of THEMIS/ARTEMIS observations in the near-Earth and middle magnetotail, the work studies both the radial distribution of the electron thermal anisotropy and the impact of electron anisotropic currents on current sheet structure for different magnetotail configurations. Moreover, using MMS observations with the high-resolution plasma measurements the work will for the first time statistically reveal the fine structure of the electron anisotropic population and its contribution to the current density. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/213479
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	IVAN VASKO .Collaborative Research: GEM--Thermal Electron Anisotropy in the Earth's Magnetotail.2019.