A Method for Recognition of Sudden Commencements of Geomagnetic Storms Using Digital Differentiating Filters

Abstract

This article describes a method for recognizing sudden commencement events using digital differentiating filters. This method is applied to INTERMAGNET observatory data. Maximum amplitude derivatives for the magnetic components (X, Y, Z) and the total intensity (F) of the geomagnetic field are introduced, and the decision-making rule is formulated. The authors developed a procedure for selecting optimal digital differentiating filters. Estimates of probabilities of correct and false recognition of sudden commencements were obtained. The calculations of the probabilistic characteristics have confirmed the effectiveness of the method.

Keywords

• geomagnetic storm
• sudden commencement
• geomagnetic data
• INTERMAGNET observatory
• decision-making rule
• digital differentiating filter