Relativistic electron ([formula omitted]) flux driving parameters over geostationary orbit using 30 years of data.

• We investigate the ranks of the driving parameters on the relativistic electrons flux at GEO orbit. • We have used cross-correlation, mutual information, and transfer entropy as statistical techniques. • We have found that AE index and solar wind velocity are the dominant driving parameters for relativistic electrons flux at GEO orbit. The relativistic electron population at MeV energy in the Earth's outer radiation belt at geostationary (GOE) orbit largely varies in association with solar wind disturbances. Although more researches have been done to understand the influence of different mechanisms that cause the variations in the relativistic electron flux in the region, but still the underlying physics is often complex and unclear. The present study uses relativistic electron (E > 2 MeV) fluxes data of Los Alamos National Laboratory (LANL) geosynchronous satellites to understand the variations and its relationship with the driving parameters. The study examines the relativistic electron fluxes variations associated with the interplanetary magnetic field (IMF) and solar wind parameters using daily averaged data from 01 January 1990 to 31 December 2018. The results indicated that the information transfer from solar wind and IMF parameters into relativistic electrons flux is dependent on the kind of driving parameter. The result identifies the rank of driving parameters based on their maximum values in the cross correlation and information transfer analysis. Thus, AE index and v sw are the dominant driving parameters for the dynamics of relativistic electrons flux at GEO orbit. The peak values of coefficient (correlation coefficients, mutual information and entropy transfer) are observed at similar lag times ( τ peak ). For instance, in the case of AE and J e , we have observed the maximum coefficient (associated with lag time) as follows; maximum correlation coefficient; CC max = 0.846 (5 days) , maximum mutual information; MI max = 0.803 (5 days) , maximum transfer entropy; TE max = 0.892 (5 days). Such dependency analysis can help to select the model parameters that influence the relativistic electrons fluxes and improve the existed models of the dynamical system. [ABSTRACT FROM AUTHOR]