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Our analysis of temperature and zonal wind data (1958 to 2006) from theNational Center for Atmospheric Research (NCAR) reanalysis (Re-1), suppliedby the National Centers for Environmental Prediction (NCEP), shows that thehemispherically symmetric 12-month equatorial annual oscillation (EAO)contains spectral signatures with periods around 11 years. Moving windows of44 years show that, below 20 km, the 11-year modulation of the EAO is phaselocked to the solar cycle (SC). The spectral features from the 48-year datarecord reveal modulation signatures of 9.6 and 12 years, which produce EAOvariations that mimic in limited altitude regimes the varying maxima andminima of the 10.7 cm flux solar index. Above 20 km, the spectra alsocontain modulation signatures with periods around 11 years, but the filteredvariations are too irregular to suggest that systematic SC forcing is theprincipal agent

Solar cycle signatures in the NCEP equatorial annual oscillation