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| 1 | 第24太阳活动周中纬度电离层低电离水平的观测研究显示文摘延续2008--2009年的太阳极低活动期,第24太阳活动周开始后太阳活动性上升缓慢,即使在趋近峰年时太阳极紫外(EuV)辐射通量的水平仍显著低于前几个活动周.比较第23、24周的太阳辐射水平,及日本国分寺和子午工程武汉站的电离层测高仪观测,发现第24周的太阳EUV辐射、电离层F区临界频率(foF2)和峰值高度(hmF2)都显著低于第23周的同期水平;在较低高度上,偏低的EuV辐射带来的电子密度变化不明显,而峰值电子密度(NmF2)和0.1~50nm太阳EuV辐射通量在多数时候都同步的偏低25%~50%;但是在夏季NmF2与EUV辐射的关联性较差,即NmF2的偏低在夏季较少.分析认为这与热层中性风的季节特点有关2在夏季午后,吹向极区的子午向风总是较弱,在第24周偏低的EuV辐射背景下,减弱的离子曳力使其他季节的极区向风得到增强,进一步促进了NmF2和hmF2的降低,使这一机制的效果非常显著.基于上述结论,在对第24周电离层进行预测预报时,需更多地考虑非直接电离机制的影响.总体而言,第24周的热层和电离层变化特征可能将有别于之前几个活动周的观测,并偏离人们在此基础上所形成的认识. | 于世美 郝永强 张东和 肖佐 | 2014 | 地球物理学报2014，57，11： | 5 |
| 2 | A brief of recent research progress on ionospheric disturbances显示文摘Ionospheric disturbances are the main causes of space weather events,which seriously influence accurate navigation,telecommunication,and so on.It is a fundamental issue to detect and analyze the disturbance processes of the ionosphere.Theoretically,the understanding of the mechanisms of most ionospheric disturbances depends on observational results.With the development of space observation techniques and related equipments,various eforts have been made to analyze the long-term statistical variations as well as sudden disturbances of ionospheric observation results.We briefly report some research progresses of ionospheric disturbances achieved in recent years,with regard to ground-based and satellites observations.The purpose is to provide a reference about the latest research progresses and improve the development of the future ionospheric disturbances observations and related researches. | XIAO Zuo YU ShiMei SHI Hao HAO Yong | 2013 | Science China(Information Sciences)2013，56，12： | 5 |
| 3 | Particle bursts in the inner radiation belt related to global lightning activity显示文摘Particle bursts(PBs),the phenomena characterized by short-term increases of particle counting rates(CRs),were observed by space-borne radiation belt particle detectors.With the electron CR data obtained by National Oceanic and Atmospheric Administration(NOAA)-18 satellite,the occurrence of PBs in the inner belt(1 L 2 and B 20.5 T)were derived for years2006–2011.The monthly occurrence number of PBs exhibits a strong maximum in northern summer(May–August).In association with global lightning data,the seasonal occurrence of PBs is found to be consistent with the lightning activity,especially if only lightning flashes at latitudes>20°are taken into account.The positive correlation between PBs and mid-latitude lightning discharges indicates the role of lightning-induced whistler waves,and is consistent with the expected pitch-angle scattering by wave-particle interactions.The contribution of lightning is so significant that it forms a non-negligible seasonal background of PBs.If one connects PBs to seismoelectromagnetic emissions(SEME)in attempt to find the earthquake precursor,the lightning background needs to be considered with great care. | WU Fei HAO YongQiang ZHANG DongHe | 2013 | Science China(Technological Sciences)2013，56，11： | 3 |
| 4 | Review of ionospheric irregularities and ionospheric electrodynamic coupling in the middle latitude region显示文摘This paper briefly reviews ionospheric irregularities that occur in the E and F regions at mid-latitudes. Sporadic E(ES) is a common ionospheric irregularity phenomenon that is first noticed in the E layer. ES mainly appears during daytime in summer hemispheres, and is formed primarily from neutral wind shear in the mesosphere and lower thermosphere(MLT) region. Field-aligned irregularity(FAI) in the E region is also observed by Very High Frequency(VHF) radar in mid-latitude regions. FAI frequently occurs after sunset in summer hemispheres, and spectrum features of E region FAI echoes suggest that type-2 irregularity is dominant in the nighttime ionosphere. A close relationship between ES and E region FAI implies that ES may be a possible source of E region FAI in the nighttime ionosphere. Strong neutral wind shear, steep ES plasma density gradient, and a polarized electric field are the significant factors affecting the formation of E region FAI. At mid-latitudes, joint observational experiments including ionosonde, VHF radar, Global Positioning System(GPS) stations, and all-sky optical images have revealed strong connections across different scales of ionospheric irregularities in the nighttime F region, such as spread F(SF), medium-scale traveling ionospheric disturbances(MSTID), and F region FAI.Observations suggest that different scales of ionospheric irregularities are generally attributed to the Perkins instability and subsequently excited gradient drift instability. Nighttime MSTID can further evolve into small-scale structures through a nonlinear cascade process when a steep plasma density gradient exists at the bottom of the F region. In addition, the effect of ionospheric electrodynamic coupling processes, including ionospheric E-F coupling and inter-hemispheric coupling on the generation of ionospheric irregularities, becomes more prominent due to the significant dip angle and equipotentiality of magnetic field lines in the mid-latitude ionosphere. Polarized electric fields can map to different ionospheric regions and excite plasma instabilities which form ionospheric irregularities. Nevertheless,the mapping efficiency of a polarized electric field depends on the ionospheric background and spatial scale of the field. | Yi Liu Chen Zhou Tong Xu Qiong Tang ZhongXin Deng GuanYi Chen ZhuangKai Wang | 2021 | Earth and Planetary Physics2021，5，5： | 2 |
| 5 | 中纬地区日间类扩展F不规则结构的观测研究显示文摘基于高频多普勒观测,研究中纬地区日间类扩展F现象及其与其他电离层扰动现象的关联.结果表明:日间类扩展F具有出现时间覆盖面广、持续时间长、与其他电离层扰动相互伴随等特征;形态特征表现为回波弥散(与夜间扩展F相似),弥散回波的频移多倾向于正向偏移,有时与行进电离层扰动(TIDs)相互伴随.日间类扩展F现象虽然是偶发事件,且发生率极低,但其出现时间及区域的广泛性充分体现了该现象对空间天气及空间环境的影响具有不可忽视的重要性. | 肖赛冠 肖佐 史建魁 张东和 郝永强 | 2016 | 空间科学学报2016，36，6： | 1 |
| 6 | 子午工程二期电离层高频多普勒监测仪初步观测结果显示文摘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. | 郝永强 代国峰 张东和 肖佐 | 2024 | 地球与行星物理论评(中英文)2024，55，1： | 0 |
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