The influence of IMF parameters on the depression of residual H – component of geomagnetic field at Mbour and Tamanrasset Geomagnetic Observatory stations was studied in 2004 and 2010. The measure of storm occurrence (Dst index) was used to select successful storm days. The effect of IMF parameters on residual H – component was investigated using filter analysis. The results showed very close correspondence of rapid changes in amplitudes between residual H – component and IMF parameters of solar wind velocity, proton density, Bz, VP and PB as examined in time and frequency domains. The quantitative relationship between residual H – component and IMF parameters of solar wind velocity, proton density, Bz, VP and PB was found to be 0.50, 0.55, 0.70, 0.60 and 0.63 respectively. This is direct evidence that Bz, PB and VP are more effective in causing geomagnetic fluctuations at equatorial low latitude stations.
Keywords: IMF parameters and noise interference, magnetosphere, residual field, storm
