国际参考电离层模型IRI(the international reference ionosphere model)是利用全球电离层测站以及卫星观测数据建立的电离层经验模型,并广泛用于电离层研究领域.本文选用2014年地磁暴平静期的IRI-2016模式和电离层垂测仪的数据,对电离...国际参考电离层模型IRI(the international reference ionosphere model)是利用全球电离层测站以及卫星观测数据建立的电离层经验模型,并广泛用于电离层研究领域.本文选用2014年地磁暴平静期的IRI-2016模式和电离层垂测仪的数据,对电离层F2层峰值电子密度NmF2和峰值高度HmF2两个物理量,通过IRI模型最新版本(IRI-2016)在地磁环境平静期的误差精度进行评估.根据不同磁倾角范围分别选择5个台站(Juliusruh(54°N,13°E)磁倾角:68.54°,Okinawa(26°N,128°E)磁倾角:37.26°,Jicamarca(12°S,77°W)磁倾角:-0.26°,Port_Stanley(52°S,58°W)磁倾角:-51.20°,Hermanus(34°S,19°E)磁倾角:-64.24°)进行NmF2和HmF2参数对比分析.5个台站中Port_Stanley站的NmF2相关性最差(相关系数0.68),Okinawa站HmF2相关性最差(相关系数0.52),Juliusruh站两个参数的相关性最高(相关系数0.87).以Juliusruh站为例进行白昼、夜晚以及不同季节的分析,可以看出白昼误差明显低于夜晚,相较于分季(春或秋)和冬季,IRI模型在夏季预测效果最好.5个台站的研究结果表明,IRI模型与垂测仪数据具备一致性,IRI模型的值高于实测数据值.展开更多
On the basis of a multiple linear regression model performed for ionospheric NmF2, partial correlation method is first applied to investigating the relation between NmF2 and h (the height of isobaric level) in the low...On the basis of a multiple linear regression model performed for ionospheric NmF2, partial correlation method is first applied to investigating the relation between NmF2 and h (the height of isobaric level) in the lower atmosphere over Wuhan, China during 1957―2004. The results show that partial correlation method can eliminate the influences of solar and geomagnetic activities as well as the seasonal varia- tion factors and reveal the true correlation between NmF2 and h in the lower atmosphere. A weak posi- tive correlation between NmF2 and h is found in the middle stratosphere. In addition, by comparing the partial correlation coefficients between NmF2 and its influence factors, we find that NmF2 is mainly affected by solar activity and the seasonal variation factors, and weakly affected by geomagnetic ac- tivity, but hardly affected by h in the lower atmosphere. The study suggests that partial correlation method is a helpful tool for investigating the correlation between ionospheric parameter and its influ- ence factors.展开更多
Ionospheric peak value of F2 layer(Nm F2)is an important parameter in the ionosphere,which has important applications in short-wave communication,ionospheric modeling and so on.In this paper,the empirical orthogonal f...Ionospheric peak value of F2 layer(Nm F2)is an important parameter in the ionosphere,which has important applications in short-wave communication,ionospheric modeling and so on.In this paper,the empirical orthogonal function(EOF)decomposition method is used to analyze the Nm F2obtained from the occultation data.Daily spatial distribution of Nm F2at the same time is relatively even.Variance of first modal is much larger than the other modals.A local wavelet power spectrum(LWPS)method is applied to analysis the cycle of F10.7index and time coefficient of first modal.The result shows that they have similar cycle distribution,indicating that F10.7index is the main factor affecting variation of Nm F2.A function is established between the tine coefficient of first modal and F10.7index,average F10.7index value of early 81 days fp by least squares method.The results show that contribution coefficient of fp is negative which indicates that fp has an inert effect existing in the ionosphere.Contribution coefficient of F10.7is positive,which is consistent with the fact that it has an anomaly in winter/spring seasons.In summary,it is feasible to establish a mid-latitude empirical Nm F2model in northern hemisphere based on occultation data and EOF decomposition method.展开更多
文摘国际参考电离层模型IRI(the international reference ionosphere model)是利用全球电离层测站以及卫星观测数据建立的电离层经验模型,并广泛用于电离层研究领域.本文选用2014年地磁暴平静期的IRI-2016模式和电离层垂测仪的数据,对电离层F2层峰值电子密度NmF2和峰值高度HmF2两个物理量,通过IRI模型最新版本(IRI-2016)在地磁环境平静期的误差精度进行评估.根据不同磁倾角范围分别选择5个台站(Juliusruh(54°N,13°E)磁倾角:68.54°,Okinawa(26°N,128°E)磁倾角:37.26°,Jicamarca(12°S,77°W)磁倾角:-0.26°,Port_Stanley(52°S,58°W)磁倾角:-51.20°,Hermanus(34°S,19°E)磁倾角:-64.24°)进行NmF2和HmF2参数对比分析.5个台站中Port_Stanley站的NmF2相关性最差(相关系数0.68),Okinawa站HmF2相关性最差(相关系数0.52),Juliusruh站两个参数的相关性最高(相关系数0.87).以Juliusruh站为例进行白昼、夜晚以及不同季节的分析,可以看出白昼误差明显低于夜晚,相较于分季(春或秋)和冬季,IRI模型在夏季预测效果最好.5个台站的研究结果表明,IRI模型与垂测仪数据具备一致性,IRI模型的值高于实测数据值.
基金Supported by the KIP Pilot Project (Grant No. KZCX3-SW-144)the National Natu-ral Science Foundation of China (Grant No. 40636032)National Important Basic Research Project (Grant No. 2006CB806306)
文摘On the basis of a multiple linear regression model performed for ionospheric NmF2, partial correlation method is first applied to investigating the relation between NmF2 and h (the height of isobaric level) in the lower atmosphere over Wuhan, China during 1957―2004. The results show that partial correlation method can eliminate the influences of solar and geomagnetic activities as well as the seasonal varia- tion factors and reveal the true correlation between NmF2 and h in the lower atmosphere. A weak posi- tive correlation between NmF2 and h is found in the middle stratosphere. In addition, by comparing the partial correlation coefficients between NmF2 and its influence factors, we find that NmF2 is mainly affected by solar activity and the seasonal variation factors, and weakly affected by geomagnetic ac- tivity, but hardly affected by h in the lower atmosphere. The study suggests that partial correlation method is a helpful tool for investigating the correlation between ionospheric parameter and its influ- ence factors.
基金supported by the National Natural Science Foundation of China(Grant No.40505005)the Specialized Research Fund for State Key Laboratories(Grant No.Y22612A33S)
文摘Ionospheric peak value of F2 layer(Nm F2)is an important parameter in the ionosphere,which has important applications in short-wave communication,ionospheric modeling and so on.In this paper,the empirical orthogonal function(EOF)decomposition method is used to analyze the Nm F2obtained from the occultation data.Daily spatial distribution of Nm F2at the same time is relatively even.Variance of first modal is much larger than the other modals.A local wavelet power spectrum(LWPS)method is applied to analysis the cycle of F10.7index and time coefficient of first modal.The result shows that they have similar cycle distribution,indicating that F10.7index is the main factor affecting variation of Nm F2.A function is established between the tine coefficient of first modal and F10.7index,average F10.7index value of early 81 days fp by least squares method.The results show that contribution coefficient of fp is negative which indicates that fp has an inert effect existing in the ionosphere.Contribution coefficient of F10.7is positive,which is consistent with the fact that it has an anomaly in winter/spring seasons.In summary,it is feasible to establish a mid-latitude empirical Nm F2model in northern hemisphere based on occultation data and EOF decomposition method.
