Thermospheric inter-annual variability and its potential connection to ENSO and stratospheric QBO

摘要: Using a 46-year-long dataset of the thermospheric density during 1967–2012, we examined inter-annual variability in thermosphere at 400 km and its potential connection to El-Nino Southern Oscillation (ENSO) stratospheric Quasi-Biennial (QBO). Wavelet analysis reveals two major modes oscillation, with slower mode having an average period ~64 months faster ~28 months. The bears high coherence ENSO 1982–2012, while is found vary coherently QBO around 1972, 1982 2002. Further examination that between significantly influenced by their common coherent variation solar flux, much less contaminated. Therefore, conclude 28-month periodicity may be caused both radiation, whereas 64-month possibly arises mainly from processes, little/small contribution radiation.