ИСТИНА

One of the main feature of the magnetospheric dynamics during magnetic storms is the motion of the auroral oval to the equator and the development of the powerful ring current. The main magnetic disturbances at the auroral latitudes are connected with the development of the westward electrojet. The motion of the auroral oval to the equator is accompanied by the motion to the equator of the auroral electrojet and the increase of the intensity of ultra low frequency (ULF) waves. We analyze the position of the auroral electrojet and ULF activity during magnetic storms for the period of Van Allen Probes mission. We also produce such analysis for a number of great magnetic storms with min Dst<-200 nTl. We compare the localization of the position of the start of the increase of relativistic electrons for the Van Allen Probes period with the latitude of the westward electrojet and show that such increase is localized near its equatorial boundary. We compare the results of observations with the suggested theories of the acceleration of relativistic electrons.