检索结果-南通市图书馆

A cross-type imaging electron spectrometer

Science China(Technological Sciences) 2023年第3期66卷 641-653页

作者： YE YuGuang ZOU Hong WANG YongFu QIN JunFeng SHI WeiHong ZOU JiQing ZHONG WeiYing ZONG QiuGang FU SuiYan School of Earth and Space Sciences Peking UniversityBeijing 100871China

Energetic electron measurement is of great significance to theoretical space physics research and space weather *** energetic electron detectors must cooperate with a spin-stabilized satellite platform to achieve high angular resolution in pitch angle distribution and three-dimensional(3D)imaging measurement of energetic *** article introduces a cross-type quasi-3D imaging electron spectrometer(IES)based on pinhole imaging technology developed in the *** imager is composed of five imaging units,including a nine-pixel area array Si-PIN detector imaging unit in the middle and four three-pixel linear array Si-PIN detector imaging units placed in a cross-shape around *** combination of five imaging units forms two orthogonal nine-pixel linear array detectors(with a common pixel in the middle).There are four pixels with a view angle of 20°×20°in the 45°oblique directions of the cross-type detection *** are 21 imaging pixels in the entire crosstype sensor head,corresponding to 21 *** multichannel integrated preamplifier ASICs are integrated in the sensor head to realize particle signal readout from 21 *** a back-end electronics system,each pixel can achieve high energy resolution detection of 50–600 keV *** sources and electron accelerators are used to calibrate the cross-type imaging sensor head,and the results demonstrate its good energy and directional detection characteristics(the energy resolution reaches 6.9 keV for the incident 200 keV electron beam).We performed simulations on the imaging sensor head’s ability to measure the electron pitch angle distribution on the three-axis stabilized platform,and the results show that the sensor head can perform quasi-three-dimensional detection of electrons incident within 2πsolid angles on the three-axis stabilized satellite platform,with an average angular resolution of the electron pitch angle distribution of less than 6°.

关键词： energetic electron detection imaging electron spectrometer cross-type sensor head pitch angle distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Medium-energy electron spectrometers on Macao Science Satellite-1

引用

Science China(Technological Sciences) 2024年第11期67卷 3324-3343页

作者： YE YuGuang LIU Ying ZOU Hong ZONG QiuGang CHEN JiaLi YU XiangQian SHI WeiHong OU JiaMing LIU JianBin YU LiJia ZHOU Jun HUANG He YUAN ShiGeng SU Wen SUO Le State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyCNSA Macao Center for Space Exploration and ScienceMacao 999078China School of Earth and Space Sciences Peking UniversityBeijing 100871China Shandong Aerospace Electro-technology Yantai 264043China School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China DFH Satellite Co.Ltd. Beijing 100081China Institute of Remote Sensing Satellite China Academy of Space TechnologyBeijing 100094China

The Macao Science Satellite-1 is a two-satellite constellation specifically designed to study the geomagnetic field and particle radiation environment in low Earth orbit,particularly in the South Atlantic Anomaly region,with a low inclination *** of the two MSS-1 satellites carries a medium-energy electron spectrometer(MES).The MES sensor heads are based on pinhole imaging technology,which can simultaneously measure 50-600 keV electrons incident from nine directions with a field of view(FOV)of 180°×30°.The two MESs can realize the pitch angle coverage of medium energy electrons at most positions in the *** MSS-1 A/B MESs can realize direct observation of precipitating electrons and electrons near their loss *** can help to study the electron generation mechanism in the inner radiation belt and quantify the precipitation of magnetospheric energetic *** with the geomagnetic index,solar wind parameters,interplanetary magnetic field conditions,etc.,it can also help to build a dynamic evolution model of energetic electrons in the near-Earth space,to realize the early warning and prediction of space weather based on the observation data,which can provide safety for spacecraft and astronauts in the nearEarth space.

关键词： Macao Science Satellite-1 medium-energy electron spectrometer inner radiation electrons Southern Atlantic Anomaly pitch angle distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Statistical study on the suprathermal electrons properties around dipolarization fronts in Earth's magnetotail

引用

Science China(Technological Sciences) 2015年第6期58卷 961-966页

作者： WANG Yue ZHOU Meng DENG XiaoHua Institute of Space Science and Technology Nanchang University

In order to investigate the suprathermal electron flux(>30 ke V) around dipolarization fronts(DFs), we statistically studied the suprathermal electron flux variations and pitch angle distributions of hundreds of earthward propagating DFs observed by THEMIS spacecraft during its tail seasons in years 2008–2009. We focused on the electron flux variations across DFs and electron anisotropies behind DFs. We divided DF into three sectors in the equatorial plane: Dusk, central and dawn sectors. The sectors are defined according to the DF normals with respect to DF's meridian in the equatorial plane(the symmetric line of DF). We found that events with electron flux increases and decreases behind the fronts had no particular dependence on the observation locations. In addition, there was no obvious dependence of electron anisotropy behind DF on the different sectors of DF.

关键词： suprathermal electrons dipolarization front (DF) pitch angle distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The anisotropy of suprathermal electrons in the Martian ionosphere

引用

Earth and Planetary Physics 2024年第3期8卷 459-471页

作者： YuTian Cao Jun Cui XiaoShu Wu WenJun Liang RuiQi Fu HaoYu Lu Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519082China Key Laboratory of Geospace Environment University of Science&Technology of ChinaChinese Academy of SciencesHefei 230026China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China School of Space and Environment Beihang UniversityBeijing 102206China

Suprathermal electrons are an important population of the Martian ionosphere, either produced by photoionization of atmospheric neutrals or supplied from the Solar Wind (SW). This study is dedicated to an in-depth investigation of the pitch angle distribution of suprathermal electrons at two representative energies, 19−55 eV and 124−356 eV, using the extensive measurements made by the Solar Wind Electron Analyzer on board the Mars Atmosphere and Volatile Evolution. Throughout the study, we focus on the overall degree of anisotropy, defined as the standard deviation of suprathermal electron intensity among different directions which is normalized by the mean omni-directional intensity. The available data reveal the following characteristics: (1) In general, low energy electrons are more isotropic than high energy electrons, and dayside electrons are more isotropic than nightside electrons;(2) On the dayside, the anisotropy increases with increasing altitude at low energies but remains roughly constant at high energies, whereas on the nightside, the anisotropy decreases with increasing altitude at all energies;(3) Electrons tend to be more isotropic in strongly magnetized regions than in weakly magnetized regions, especially on the nightside. These observations indicate that the anisotropy is a useful diagnostic of suprathermal electron transport, for which the conversion between the parallel and perpendicular momenta as required by the conservation of the first adiabatic invariant, along with the atmospheric absorption at low altitudes, are two crucial factors modulating the observed variation of the anisotropy. Our analysis also highlights the different roles on the observed anisotropy exerted by suprathermal electrons of different origins.

关键词： Mars ionosphere suprathermal electron pitch angle distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bidirectional electron conic observations for photoelectrons in the Martian ionosphere

引用

Earth and Planetary Physics 2020年第4期4卷 403-407页

作者： YuTian Cao Jun Cui BinBin Ni XiaoShu Wu Qiong Luo ZhaoGuo He Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China School of Atmospheric Sciences Sun Yat-sen UniversityZhuhaiGuangdong 519082China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China

Electron pitch angle distributions similar to bidirectional electron conics(BECs)have been reported at Mars in previous studies based on analyses of Mars Global Surveyor *** distribution,also termed“butterfly”distribution,presents a local minimum flux at 90°and a maximum flux before reaching the local loss *** studies have focused on 115 eV electrons that were produced mainly via solar wind electron impact *** using Solar Wind Electron Analyzer measurements made onboard the Mars Atmosphere and Volatile Evolution spacecraft,we identify 513 BEC events for 19-55 eV photoelectrons that were generated via photoionization ***,we are investigating electrons observed in regions well away from their source regions,to be distinguished from 115 eV electrons observed and produced in the same *** investigate the spatial distribution of the 19-55 eV BECs,revealing that they are more likely observed on the nightside as well as near strong crustal magnetic *** propose that the 19-55 eV photoelectron BECs are formed due to day-to-night transport and the magnetic mirror effect of photoelectrons moving along cross-terminator closed magnetic field lines.

关键词： Martian ionosphere photoelectron pitch angle distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：