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The electron and ion temperature at the low-latitude ionosphere exhibits awide variety of fluctuations. Observations using SROSS-C2 satellite RPApayload during 1995–2000 provide an excellent opportunity to study thefluctuations in Te and Ti in the upper ionosphere and to understand thedynamic processes existing at those altitudes. The spectral analysis ofelectron and ion temperatures using Fourier and wavelet techniques reveal thepresence of quasi-periodicities, such as 14-day, 19-day, 27-day, 55-day, 154-day,180-day, 1-year and 1.3-year periods. The daytime and nighttime values ofTe and Ti exhibit different types of characteristic variations. Thewavelet spectrum presented depicts the temporal evolution the power of eachperiodicity present in the daytime and nighttime values of Te and Ti.The time evolution of electron and ion temperatures are compared with that ofAp and 10.7cm solar radio flux, to infer the source of temperaturefluctuations at the upper ionosphere. Key words. Ionosphere (plasma temperature and density

Observation of periodic fluctuations in electron and ion temperatures at the low-latitude upper ionosphere by SROSS-C2 satellite