Analysis of the ionospheric variability based on wavelet decomposition  

作　　者：SHI Hao ZHANG DongHe LIU YuMei HAO YongQiang 

机构地区：[1]Department of Geophysics, Peking University [2]National Key Laboratory of Electromagnetic Environment, China Research Institute of Radio Wave Propagation

出　　处：《Science China(Technological Sciences)》2015年第1期174-180,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41174134 and 41274156);the National Basic Research Program of China("973"Project)(Grant No.2011CB811405)

摘　　要：In this work,the ionospheric variability is analyzed by applying the wavelet decomposition technique to the noontime fo F2,F10.7,interplanetary magnetic field(IMF)Bz,Ap,and lower thermospheric temperature at pressure of 10?4 h Pa in 2002.Results show that the variance of periodic oscillations in the ionosphere is largest in the 2–4-day period and declines with the increase of the period.The maximum variance of the periodic oscillations in solar irradiation is in the 16–32-day period.For geomagnetic activities,most of the variance is about equally distributed on intervals of periods shorter than 32 days.Variance distributions of IMF Bz and lower thermospheric temperature are similar to those of the ionosphere.They show the maximum in the 2–4-day period and decline with the increase of the period.By analyzing the distributions of the variances,the potential connections between the ionosphere and the external sources are discussed.

关 键 词：IONOSPHERE VARIABILITY fo F2 Wavelet decomposition 2–32-day period 

分 类 号：P352[天文地球—空间物理学] TP391.41[天文地球—地球物理学]