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国家自然科学基金(41274146)

作品数:11 被引量:5H指数:1
相关作者:史建魁王国军程征伟张子迎王铮更多>>
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11 条 记 录,以下是 1-10
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第16章 低纬地区(海南)电离层E-F谷区探测研究
<正>探空火箭携带仪器是电离层电子密度实地测量的有效途径,与遥测相比较,有着独特的优势。2011年5月7日早晨在海南电离层观测站(19.5°N,109.1°E)发射了一枚探空火箭对电离层进行了实地探测,箭载的朗缪尔探针第...
史建魁王铮
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A Model for the Sounding Rocket Measurement on an Ionospheric E-F Valley at the Hainan Low Latitude Station
2014年
To understand the physics of an ionospheric E-F valley, a new overlapping three- Chapman-layer model is developed to interpret the sounding rocket measurement in the morn- ing (sunrise) on May 7, 2011 at the Hainan low latitude ionospheric observation station (19.5°N, 109.1°E). From our model, the valley width, depth and height are 43.0 km, 62.9% and 121.0 km, re- spectively. From the sounding rocket observation, the valley width, depth and height are 42.2 km, 47.0% and 123.5 km, respectively. The model results are well consistent with the sounding rocket observation. The observed E-F valley at Hainan station is very wide and deep, and rapid deel- opment of the photochemical process in the ionosphere should be the underlying reason.
王铮史建魁关燚炳刘超朱光武Klaus TORKARMartin FREDRICH
Variation of dependence of the cusp location at different altitude on the dipole tilt被引量:3
2013年
Using the Cluster cusp crossings data,dependence of the cusp location at the mid-altitude on the geomagnetic dipole tilt during northward IMF is studied.The results show that the cusp center moves 0.051°Invariant Latitude(ILAT)upon the increase of 1°in the dipole tilt angle at the average altitude of 5.8 RE(Earth radius).According to the present results obtained at the altitude of the Cluster orbit and previous results obtained at other altitudes of other satellite orbits,it is found that the higher the altitude in the cusp region is,the bigger the dependence of cusp location on the dipole tilt angle will be.If the altitude increases by 1 RE in the cusp region,the dependence will increase by 0.012°ILAT upon the increase of 1°in the dipole tilt angle.Some possible physical mechanisms are discussed and it shows that the cusp location will be more sensitive to the solar wind dynamic pressure if the altitude is high.
GUO JianGuangSHI JianKuiCHENG ZhengWeiZHANG ZiYingWANG ZhengZHANG TieLongLIU ZhenXingDUNLOP Malcolm
关键词:磁偶极子地球半径物理机制
Comparison of Diurnal,Seasonal and Solar Cycle Variations of High-latitude,Mid-latitude and Low-latitude Ionosphere被引量:1
2014年
Comparison of regular(diurnal,seasonal and solar cycle)variations of high-latitude,mid-latitude and low-latitude ionospheric characteristics has been provided on basis of local empirical models of the peak electron density and the peak height.The local empirical models were derived from the hand-scaled ionogram data recorded by DPS-4 digisondes located at Norilsk(69°N,88°E),Irkutsk(52°N,104°E)and Hainan(19°N,109°E)for a 6-year period from December,2002 to December,2008.The technique used to build the local empirical model is described.The primary focus is diurnal-seasonal behavior under low solar activity and its change with increasing solar activity.Both common and specific features of the high-latitude(Norilsk),mid-latitude(Irkutsk)and low-latitude(Hainan)regular variations were revealed using their local empirical models.
K G RATOVSKYJ K SHIA V OINATSE B ROMANOVA
关键词:DIURNAL
地球磁层极尖区场向电子事件期间能量特性研究
2016年
根据Cluster卫星2001年9月30日在北半球极尖区观测到的一次强扰动场向电子事件数据,分析研究了这次事件期间场向电子的能量特性,讨论了场向电子对太阳风能量向磁层的传输和磁层-电离层耦合过程中能量传输的作用.分析认为,这次电子扰动事件期间电子速度和密度都具有很强的扰动变化,电子速度增加是一个主要特点.本次事件中低能段5~200 eV和500~1500 eV内的能谱分析结果表明,上行电子通量大于下行电子通量,上行电子主要来源于电离层,说明电离层上行电子在本次事件中具有非常活跃的作用.根据电离层中带电粒子的能量特征分析结果可知,这次事件中电离层起源的上行电子在上行过程中得到了加速.关于加速机制问题还有待深入研究.
史建魁张子迎TORKAR Klaus王铮程征伟王国军
关键词:极尖区
Response of the Ionospheric F_2-region Over Irkutsk and Hainan to Strong Geomagnetic Storms被引量:1
2013年
The ionospheric responses to two strong storms on 17-19 August 2003 and 22-23 January 2004 are studied,using the data from Irkutsk(52.5°N,104°E) and Hainan(19.5°N,109°E) ionospheric stations.The analysis of variations in relative deviations of the critical frequency △f_0F_2 revealed that at middle latitudes(Irkutsk) negative disturbances were observed in the summer ionosphere; positive and negative ones,in the winter ionosphere during the main and recovery phases respectively.At low latitudes(Hainan),the disturbances were positive in all the cases considered. Mechanisms of the disturbances were analyzed with the aid of empirical models of the neutral atmosphere NRLMSISE-00 and thermospheric wind HWM07.The main factors determining △f_0F_2 variations at middle latitudes during the storms were demonstrated to be the disturbed equatorward thermospheric wind transporting the disturbed atmospheric composition,the increase in the atomic oxygen concentration,and the passage of internal gravity waves.At low latitudes,the effects associated with neutral composition variations are less significant than those of the thermospheric wind and electric fields.
E B RomanovaG A ZherebtsovK G RatovskyN M PolekhJ K ShiX WangG J Wang
关键词:IONOSPHEREDRIFT
磁暴期间极尖区场向电子事件研究
2014年
根据Cluster卫星在中高度极尖区的观测数据,分析研究了两次连续磁暴期间极尖区场向电子事件的持续时间以及与Dst值和Dst时间变化率之间的关系.结果表明,磁暴期间场向电子事件的持续时间的范围为6~54 s,大多数场向事件的持续时间小于34 s;极尖区场向电子事件的最大密度和最大场向通量与Dst值没有明显的相关关系;而随着Dst变化率的增加,场向电子最大密度和最大通量也随之增加,场向电子最大密度与Dst变化率之间的相关系数为0.81,场向电子最大通量与Dst变化率之间的相关系数为0.56,下行电子最大通量与Dst变化率之间的相关系数为0.85.经讨论认为行星际磁场持续南向、太阳风速度和动压的急剧增加是引起场向电子通量增加的主要原因.
张子迎史建魁程征伟
关键词:极尖区
磁暴不同相位期间低纬海南地区电离层扩展F分布特性研究
2013年
基于2002—2007年海南地区DPS—4测高仪探测数据,对海南地区电离层四种类型扩展F,包括频率型(FSF)、区域型(RSF)、混合型(MSF)和强区域型(SSF),在磁暴不同相位期间的年际变化和总体分布特性进行了统计分析研究。结果表明:(1)在初相期间,较为活跃的扩展F是在高年(2002)和下降年(2003—2004)的SSF,以及低年(2005—2007)的MSF;(2)在主相期间,较为活跃的扩展F是2002、2006年的SSF和2005、2007年的MSF;(3)在恢复相期间,较为活跃的扩展F是2002年的SSF和2003—2006年的MSF,并且MSF的发生率随太阳活动减弱(从2002年到2006年)有增加趋势。总体上,最为活跃的是SSF和MSF,其次是FSF,而最不活跃的是RSF。分析还表明,初相期间扩展F的发生率要高于主相和恢复相的发生率,这说明快速渗透电场对初相期间的扩展F有促进作用;而主相和恢复相期间扩展F的发生率则受到了快速渗透电场、扰动电场等因素的共同作用。
王国军史建魁王霄罗智贤
关键词:低纬电离层扩展F
Investigation of Total Absorption of Radio Waves in High Latitude Ionosphere
2014年
Using the digisonde data observed at ionospheric station Norilsk (Dip lat. 60~N) in 2006, a statistical study on the characteristics of the ionospheric plasma total absorption of radio waves (IPTAR) was performed. In the winter and some months of equinox, the IPTAR mainly occurred in the nighttime and the highest occurrence rate could be up to 90%. In the summer, the occurrence was relatively low and the differences between nighttime and daytime occurrence reduced. The total duration of IPTAR seemed longer around the winter than that around the summer. The occurrence of IPTAR events ascended as the Kp index increased. The frequent precipitation of energetic particles into the ionospheric plasma in the auroral belt may be the main cause of the IPTAR events.
史建魁王铮陶伟G.A.ZHEREBTSOVE.B.ROMANOVAK.G.RATOVSKY
关键词:IONOSPHERE
极区场向电子事件持续时间的统计研究
2013年
利用Cluster卫星的4s分辨率数据,对极区高高度4~8Re范围内的场向电子事件进行了统计,分析了场向电子事件持续时间的分布特性,并研究了不同地磁条件下场向电子事件持续时间的分布.结果表明:极区高高度范围场向电子事件的持续时间为6 ~ 475 s,大部分场向电子的持续时间小于50 s,在持续时间10~ 20 s内,场向电子事件最容易发生;持续时间长的场向电子在北半球上行的情况下发生较多;持续时间较长的场向电子事件一般都发生在地磁场By较小的条件下.
张子迎史建魁程征伟
关键词:极区持续时间
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