Total Electron Content Lunar Variation at Two Midlatitude Stations

Total electron content data of a year of the Ebro and Hamilton stations have been analyzed by the Chapman-Miller method and the components of the solar and lunar tides at both stations obtained. The same analysis has been performed with the data grouped by seasons. All results but the ones corresponding to Ebro equinoxes, are significant at the 5% level, and agree with results of other authors. The non-significance of the equinoxes results seems to be related to the location of the focus of the dynamo ionospheric currents. Also the semimonthly lunar tide and its diurnal solar variation are obtained and the results are discussed.