d in daily averages of Ap index for geomagnetic disturbances from the World Data Center (WDC) at the International Association for Geomagnetism and Aeronomy (IAGA) are also examined for the same four-year time span. By Fourier power spectral analyses, the CME data appears to contain significant power peaks at periods of ～358±38, ～272±26, ～196±13 days and so forth, while except for the ～259±24-day period, X-ray solar flares of class>～M5.0 show the familiar Rieger-type quasi-periods at ～157±11, ～122±5, ～98±3 days and shorter ones until ～34±0:5 days. In the data of daily averages of Ap index, the two significant peaks at periods ～273±26 and ～187±12 days (the latter is most prominent) could imply that CMEs (periods at ～272±26 and ～196±13 days) may be proportionally correlated with quasi-periodic geomagnetic storm disturbances; at the speculative level, the ～138 ±6-day period might imply that X-ray flares of class>M5.0 (period at ～157±11 days) may drive certain types of geomagnetic disturbances; and the ～28±0:2-day periodicity is most likely caused by recurrent high-speed solar winds at the Earth's magnetosphere. For the same three data sets, we further perform Morlet wavelet analysis to derive period-time contours and identify wavelet power peaks and timescales at the 99 percent confidence level for comparisons. Several conceptual aspects of possible equatorially trapped Rossby-type waves at and beneath the solar photosphere are discussed.