%0 Journal Article
%T A study of correlation distance of the day to day variability of F2 layer peak electron density over Europe<br>欧洲地区电离层峰值电子密度逐日变化的相关距离研究
%A YU Xiao
%A WAN Wei-Xing
%A LIU Li-Bo
%A YUE Xin-An
%A XU Gui-Rong
%A <br>於晓
%A 万卫星
%A 刘立波
%A 乐新安
%A 徐桂荣
%J 地球物理学报
%D 2007
%I 
%X In order to study the correlation distance S of the ionospheric day-to-day variability,especially the diurnal and seasonal variation of S and how it changes with solar and geomagnetic activities,we adopted the ionospheric F_2-layer peak electron density,N_mF_2,obtained from 22 European stations.We first used an exponential function to describe how the correlation coefficient R of the ionospheric day-to-day variability between any two stations changes with its distance d,and then from that computed the correlation distance S. We then studied the diurnal variation of correlation distance S versus universal time for different seasons(spring,summer,autumn and winter),different geomagnetic activity levels(quiet and disturbed),and different solar activity levels(low,medium and high).We found that:(1) The ranges of S are confined from 400 up to 1600 km;(2) The values of S are larger at daytime than nighttime;(3)There are seasonal trends of S,generally,the S values are largest in summer,smallest in winter,and the differences between it in spring and autumn are quite small.(4) When the geomagnetic activity level is disturbed,the S values are larger than when quiet.(5) From sundown to noon of next day the S values are distinctly smaller when the solar activity level is low,than those when the solar activity level is medium or high,but from noon to just before sundown,the S values change little with the solar activity levels.Based on the above results,we conclude that:(1) The influences of solar radiation on the ionospheric day-to-day variability are of large-scale,and are larger at daytime and when the solar activity level is high than at nighttime and when the solar activity level is low.(2) The influences of geomagnetic activity are also of large-scale.(3) The meteorological influences are relatively of small-scale and the day-to-day variability has seasonal trends.From the standpoint of the correlation scales,we validated the known conclusion that the sources of ionospheric day-to-day variability include the solar radiation,the disturbances from the geomagnetic and meteorological activities.
%K Ionospheric F_2-layer
%K Day-to-day variability
%K Correlation distance
%K Correlation analysis
%K Europe<br>电离层F2层
%K 逐日变化
%K 相关距离
%K 相关分析
%K 欧洲地区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=F28DF9F8D8353170&yid=A732AF04DDA03BB3&vid=771152D1ADC1C0EB&iid=94C357A881DFC066&sid=2F8F471CEC23CD85&eid=55C36125E841856F&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=18