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The correlation of flare's location on solar disc and the sudden increase of total electron content

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Chinese Science Bulletin 2002年第1期47卷 82-85页

作者： zhang donghe, xiao Zuo & CHANG QingDepartment of geophysics, peking university, beijing 100871, china Qingdao Research Center, china Research Insitute of Radio-wave Propagation, Qingdao 266071, china Department of Electronic Engineering, beijing Universit Department of geophysics Peking University Beijing China Qingdao Research Center China Research Insitute of Radio-wave Propagation Qingdao China Department of Electronic Engineering Beijing University of Aeronautics and Astronautics Beijing China

The correlation of flare’s location on solar disc with the value of sudden increase of total electron content is analyzed with flare’s parameters observed by GOES satellite from 1997 to 1999 and total electron content derived from GPS data observed by international GPS Service for Geo-dynamics. It is found that, besides the flare’s maximum X-ray flux, flare’s location on solar disc has some relation with the value of SITEC during the flare. The ionospheric response to a flare with a smaller maximum X-ray flux and nearer angular distance to the Sun’s central meridian line may be stronger than that of the flare with a larger maxi-mum X-ray flux and far angular distance. To the flares with the same class of maximum X-ray flux, the nearer the angu-lar distance to the Sun’s meridian, the stronger the ionospheric response.

关键词： flare SITEC GPS.

Energetic particle radiations measured by particle detector on board CBERS-1 satellite

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Chinese Science Bulletin 2007年第5期52卷 665-670页

作者： HAO YongQiang xiao Zuo ZOU Hong zhang donghe Department of geophysics Peking University Beijing 100871 China Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

Using the data measured by energetic particle detector on board CBERS-01 and -02 for the past five years, statistics was made to show the general features of MeV electrons and protons along a solar synchronous orbit at an altitude of 780 km. This height is in the bottom region of the Earth's radiation belts. Detectors are inside the satellite cabinet and such continuous monitoring of particle radiation environment inside a satellite has seldom conducted so far. After a proper and careful treatment, it is indicated that the data inside satellite are well correlated with the radiation environment outside. Be-sides the agreement of the general distribution characteristics of energetic electrons and protons with similar observations from other satellites, attention is particularly paid to the disturbed conditions. Variations of particle fluxes are closely related with solar proton events, in general, electron fluxes of outer belt are well correlated with Dst index after three days' delay while the electron injection occurred almost at the same day during great magnetic storms. It is confirmed that both energetic electrons and protons appear in the Polar Cap region only after the solar proton events.

关键词： CBERS-01 地球资源卫星高能粒子辐射粒子探测器测量空间环境辐射带

The estimation method of GPS instrumental biases

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Chinese Science Bulletin 2001年第3期46卷 204-207页

作者： CHANG Qing zhang donghe xiao Zuo zhang Qishan Department of geophysics Peking UniversityBeijing 100071China Department of Electronic Engineering Beijing University of Aeronautics and AstronauticsBeijing 100083China

A model of estimating the global positioning system (GPS) instrumental biases and the methods to calculate the relative instrumental biases of satellite and receiver are presented. The calculated results of GPS instrumental biases, the relative instrumental biases of satellite and receiver, and total electron content (TEC) are also shown. Finally, the stability of GPS instrumental biases as well as that of satellite and receiver instrumental biases are evaluated, indicating that they are very stable during a period of two months and a half.

关键词： GPS instrumental biases TEC ionosphere.

Observational study of daytime ionospheric irregularities associated with typhoon

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Science china(Technological Sciences) 2012年第5期55卷 1302-1304页

作者： xiao SalGuan SHI JianKui zhang donghe HAO YongQiang HUANG WeiQuan State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of SciencesBeijing 100190China Department of geophysics Peking UniversityBeijing 100871China

Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be ob- served seldom at daytime, It is recognized that acoustic gravity waves （AGWs） play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following： 1） There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2） the blurred echo traces in the both two cases appeared in the morning （08：30-11：30 beijing time） and lasted for more than two hours; 3） with the blurred echoes gradually weakening, the traveling ionospheric disturbances （TIDs） still ex- isted and became clearer; 4） the frequency shifts in the two of the radio wave in the ionosphere moved downwards. spread-F during the typhoon period in Asian region. cases were both positive, implying the effective reflecting surface These results provide good observational evidence for daytime

关键词： ionospheric irregularity spread-F daytime typhoon

子午工程二期电离层高频多普勒监测仪初步观测结果

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地球与行星物理论评（中英文） 2024年第1期55卷 53-65页

作者：郝永强代国峰张东和肖佐中山大学大气科学学院行星环境与宜居性研究实验室珠海519082 北京大学地球与空间科学学院北京100871

子午工程二期计划在漠河、北京、武汉、深圳四地分别建设由一个发射站和三个接收站构成的电离层高频多普勒监测台阵.本文介绍了为此研制的电离层高频多普勒监测仪的进展和试观测期间取得的一些观测结果.通过与电离层测高仪进行交叉对比... 详细信息

子午工程二期计划在漠河、北京、武汉、深圳四地分别建设由一个发射站和三个接收站构成的电离层高频多普勒监测台阵.本文介绍了为此研制的电离层高频多普勒监测仪的进展和试观测期间取得的一些观测结果.通过与电离层测高仪进行交叉对比,设备的性能和探测能力得到了验证.目前该设备已部署7个站点进行试观测,本文报告了该设备探测到的太阳耀斑导致的电离层扰动、电离层行进式扰动、大尺度电场导致的多站同时扰动等多种现象.未来子午工程二期建成后,该设备将具备我国上空北至漠河、南至广东的电离层扰动监测能力,并与其它探测手段融合发挥空间天气综合监测网络的最大效能.

关键词：电离层高频多普勒频移电离层扰动子午工程

The seasonal dependence of cycle slip occurrence of GPS data over china low latitude region

同方期刊数据库博看期刊评论

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Science china(Technological Sciences) 2007年第4期50卷 422-429页

作者： zhang donghe FENG Man xiao Zuo HAO YongQiang SHI LiQin YANG GuangLin SUO YuCheng Department of geophysics Peking UniversityBeijing 100871China Center for Space Science and Applied Research Chinese Academy of SciencesBeijing 100080China National Forecasting Center for Space Weather Beijing 100080China china Research Institute for Radio Propagation Xinxiang 453003China

The relationship of daily accumulated cycle slip occurrence with the season is analyzed using the GPS data observed in six GPS stations located in china low latitude region in 2001. It is found that the seasonal dependence of cycle slip oc-currence is evident. The cycle slip mainly occurs during the periods of two equinox months (March to May and September to October), and some correlative changes of the cycle slip occurrences over all six stations are exhibited in some special days. Considering the diurnal dependence of cycle slip, it can be inferred that the cycle slip occurrence with certain elevation limitation is related with the iono-spheric irregularities over this region.

关键词： GPS cycle slip ionospheric irregularities scintillation carrier phase

非迁移潮作用下的电离层赤道异常区单峰现象及其经度分布

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地球物理学报 2019年第11期62卷 4067-4081页

作者：田耀宇郝永强张东和肖佐北京大学地球与空间科学学院

当喷泉效应较弱而双峰结构发展不充分的时候,可能在赤道异常区仅能够观测到一个电子密度的峰值,称之为单峰现象.本文利用CHAllenging Minisatellite Payload卫星在2001—2010年的电子密度数据给出了单峰的发生规律,单峰在地方时早上08:0... 详细信息

当喷泉效应较弱而双峰结构发展不充分的时候,可能在赤道异常区仅能够观测到一个电子密度的峰值,称之为单峰现象.本文利用CHAllenging Minisatellite Payload卫星在2001—2010年的电子密度数据给出了单峰的发生规律,单峰在地方时早上08:00—10:00和下午16:00—19:00发生率高,发生位置在经度上呈现多波数分布,尤其在10:00—18:00明显:在分季时多呈现四波,而在冬至季时以三波为主.单峰发生多的经度,正好对应着双峰的结构特征较弱之处.究其原因,是非迁移潮的DE2和DE3分量调制了背景风场和大气发电机电场,在电场和喷泉效应减弱的经度,双峰结构难以形成时,就会表现为单峰结构.本文扩展了对单峰现象的地方时、季节和经度分布等规律的了解,明确了非迁移潮在其中施加的影响,由此,单峰同双峰现象一样可以用于研究非迁移潮对热层-电离层的作用.

关键词：电离层赤道异常单峰/双峰结构非迁移潮汐

北半球电离层中纬槽发生率及其槽极小位置变化的统计研究

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地球物理学报 2020年第1期63卷 31-46页

作者：何世闯张东和郝永强肖佐北京大学地球与空间科学学院

本文利用2014年9月到2017年8月全球高时空分辨率TEC数据对北半球四个经度带电离层中纬槽的发生率和槽极小位置的变化进行了统计研究.基于Kp指数,我们引入了一个包含地磁活动变化历史效应的地磁指数(Kp 9)来分析中纬槽位置变化与地磁活... 详细信息

本文利用2014年9月到2017年8月全球高时空分辨率TEC数据对北半球四个经度带电离层中纬槽的发生率和槽极小位置的变化进行了统计研究.基于Kp指数,我们引入了一个包含地磁活动变化历史效应的地磁指数(Kp 9)来分析中纬槽位置变化与地磁活动水平的关系.通过与其他地磁活动指数的对比,发现槽极小纬度与Kp 9指数的相关性最好.此外,本文重点分析了中纬槽发生率及槽极小纬度的经度差异、季节变化、地方时变化以及与地磁活动强度等的关系.结果表明,中纬槽的发生率与经度关系不大,主要受到季节、地方时与地磁活动的影响.午夜中纬槽发生率在夏季较低,其随地方时的变化则呈现出负偏态分布的特点,在后半夜发生率更高,而地磁活动增强对中纬槽的发生具有明显的促进作用.对于槽极小纬度,其在四个经度带的分布差异不大,但月变化各不相同,其中-120°经度带呈单峰分布,在夏季槽极小纬度更高,而0°经度带夏季槽极小纬度更低.槽极小的位置显著依赖于地磁活动、地方时以及季节变化.一般说来,地磁活动越强,中纬槽纬度越低.中纬槽位置随地方时的变化有明显的季节差异,冬季昏侧槽极小纬度随地方时变化较快,弱地磁活动条件下22∶00 LT前即达到最低纬度,其后位置几乎保持不变,而两分季槽极小纬度从昏侧至午夜都在降低,夏季槽极小纬度从昏侧连续下降至03∶00 LT左右.

关键词：电离层中纬槽 GPS TEC数据中纬槽发生率槽极小

利用中国GPS站网对地震波引发的大尺度电离层扰动的观测

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地球物理学报 2021年第11期64卷 3925-3932页

作者：郝永强李泉翰郭建广张效信杨光林张东和肖佐北京大学地球与空间科学学院北京100871 国家空间天气监测预警中心北京100081

地震瑞利波在沿地表传输时衰减很慢,其能量在远离震中的区域仍然能够激发大气和电离层扰动.本文利用中国境内的GPS接收机网络观测电离层总电子含量(total electron content,TEC),分析了2011年日本地震后在中国区域上空产生的电离层扰动... 详细信息

地震瑞利波在沿地表传输时衰减很慢,其能量在远离震中的区域仍然能够激发大气和电离层扰动.本文利用中国境内的GPS接收机网络观测电离层总电子含量(total electron content,TEC),分析了2011年日本地震后在中国区域上空产生的电离层扰动.研究发现,瑞利波的能量从地面经大气耦合传输到电离层高度,导致在中国区域上空电离层出现与瑞利波传播同步的TEC扰动.利用中东部的稠密接收机网络,还揭示了扰动的大尺度二维空间结构:瑞利波经过后产生的TEC扰动呈条带状,在中纬度地区沿西北—东南方向排列,而在低纬度大致为东西方向.条带的转向可能与地磁场作用下的中性-离子耦合过程有关,大气波动导致的等离子扰动倾向于沿磁力线方向(向南)传播,从而形成垂直磁力线方向(东西)的波前结构.这是首次在远离震中的区域使用GPS站网研究地震波耦合电离层扰动的大尺度二维空间结构.

关键词：地震电离层扰动 GPS TEC 岩石圈-大气层-电离层耦合