Sunspot-dependence of the Geomagnetic Daily Variation in Turkey

In this study the hourly mean values of the geomagnetic data available in Turkey are analyzed to determine principal harmonics of the solar daily geomagnetic variations. Available data are grouped according to sunspot relative number to determine and analyzed for solar and lunar harmonics. The most disturbed five calendar days of the each month are removed in order to minimize the effect of current systems in the outer magnetosphere regions. Very good sunspot dependence found between solar harmonics and sunspot number.