Variations of the relativistic electron flux intensity at the geostationary satellite orbit

To reveal periodic and nonperiodic components of the external Earth radiation belt (ERB) relativistic electron flux and to study their nature, experimental data produced at the geostationary ''Raduga'' satellites, are analyzed. Separation of variations with the periods from 1 h to 1.5 years is carried out using spectral analysis methods (the Burg, Blackman-Tewkey filtration methods). The electron intensity measurement data is correlated with geomagnetic activity data and data on large-scale nonstationary and quasistationary disturbances of the solar wind. The external ERB relativistic electron flux dependence on the solar wind velocity value and the electron flux density in the interplanetary medium is discovered. Relativistic electron flux variations at L ∼ 6.6 with periods ∼ 2-3, ∼ 24 h, ∼ 7, ∼ 15, ∼ 27 and 30 days; ∼ 6 and 13 months, where L is the McIlwain parameter, are revealed