太阳活动峰年北美中纬电离层分层结构变化  

Stratified Structure Variations of the North American Mid-latitude Ionosphere During the Solar Activity Peak Years

作　　者：姜阳厚 刘晨 周鸿芸 JIANG Yanghou;LIU Chen;ZHOU Hongyun(Guangzhou Urban Planning&Design Survey Research Institute,Guangzhou 510663,China;Guangzhou Huangpu District Real Estate Registration Center,Guangzhou 510700,China)

机构地区：[1]广州市城市规划勘测设计研究院,广东广州510663 [2]广州市黄浦区不动产登记中心,广东广州510700

出　　处：《地理空间信息》2022年第11期75-80,共6页Geospatial Information

摘　　要：导航定位精度和电离层活动息息相关,尤其是在太阳活动峰年中纬度地区的电离层延迟变化显著。基于北美Millstone Hill台站提供的高精度非相干散射雷达(ISR)观测数据,可获取中纬度地区电离层垂直结构特征。首先利用Chapman-α函数反演不同高度层信息,包括台站上空0~1 000 km电子总含量(ITEC)和1 000 km以上等离子体层电子含量(PEC);再联合总电子含量(TEC)和电子密度轮廓线分析太阳活动峰年(2014年)电离层分层结构变化。结果表明,TEC和ITEC具有较高的一致性和同步变化趋势,PEC含量以及所占GPS TEC比例均具有显著的周日变化特性,其中PEC含量在当地时间19时和5时具有最大和最小值,而夜晚所占TEC比例远高于白天;季节变化上,PEC总含量和所占比例均在春秋分季节达到了最大,与同时段的GPS TEC具有较强的相关性;而电子密度剖面资料显示,F层的厚度和电子密度在春季达到最大,且F1、F2层具有明显的昼夜结构差异性。The accuracy of navigation and positioning is closely related to the ionospheric activity, especially in the mid-latitude region where the ionospheric delay is significantly impacted by solar activity. Based on the high precision observations of incoherent scatter radar(ISR) at Millstone Hill Station in North America, the vertical structure information of ionosphere is recorded. In the utility of Chapman-α function for Ne profiles and total electron content(TEC), we retrieved the ionogram-derived total electron content(ITEC) covering a height of 0~1 000 km and plasma electron content(PEC) over 1 000 km. We combined TEC and electron density profile to analyze the variations of ionospheric stratification structure in 2014(solar activity peak year). The results show that TEC and ITEC have a high consistency and synchronous response of solar activity but not always in TEC and PEC. For diurnal variation, PEC content has maximum and minimum values at 19:00 and 5:00 local time respective, and the proportion of TEC in night is much higher than that in daytime. For seasonal variation, PEC and corresponding contribution to TEC reach the maximum in equinox, which has a strong correlation with ionosphere. The electron density profiles exhibit the thickness and electron density of F layer reaching the maximum in spring, and there are obvious diurnal structural differences between F1 and F2 layers.

关 键 词：ISR Chapman-α函数 TEC PEC 电子密度 

分 类 号：P228.4[天文地球—大地测量学与测量工程]