Fuzzy logic methods for geomagnetic events detections and analysis

Abstract

Detailed study of the morphology of geomagnetic disturbances and their sources shows that various indexes of geomagnetic activity used nowadays show an activity of a geomagnetic field not on the whole Earth surface but in its separate regions. In the process of research of solar-terrestrial phenomena there emerged the necessity of simultaneous determination of the strength of geomagnetic disturbances in all observatories of the Intermagnet world stations net, i.e. an introduction of new parameters independent of geomagnetic latitudes and longitudes becomes necessary. To solve this problem a new geo-informational approach named “Discrete mathematical analysis”, FCARS algorithm in particular, is suggested. The FCARS represents an attempt to model the logics of an interpreter. The algorithm gives an estimation of limits of anomalies sought and conducts morphological review of these anomalies. As the result of the execution of these works based on algorithms of separation and analysis of anomalies in time series using fuzzy logic methods there were: introduced concepts of inner and outer strength of an anomaly of a geomagnetic variation; suggested an analysis of geomagnetic events based on data from the global network of observatories Intermagnet; described a new way of study of the dynamics of geomagnetic disturbances spreading.