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.
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.
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)
