Institution: | a Departamento de Física, USACH, Casilla 307, Santiago, Chile b Departamento de Física, Universidad Nacional San Antonio Abad del Cusco, Peru c Skobeltsyn Institute of Nuclear Physics, MSU, Moscow 119899, Vorobievi Gori, Russia d CESR, CNRS/UPS, BP 4346, 31028, Toulouse, France e Space Research Institute, RAS, Profsoyuznaya 84/32, Moscow 117810, Russia |
Abstract: | Latitudinal distribution of auroral electron precipitations was studied using the Aureol-3 satellite data. Analysis of 148 events in the morning, night, and evening sectors showed that structures of all types have a wide MLT distribution. However, during low geomagnetic activity the distribution of latitudinally asymmetric events is close to Iijima and Potemra's Region 1 and 2 current picture: the equatorward events prevail in the morning and postmidnight sectors, and the polarward ones — in the evening and premidnight. An increase in geomagnetic activity makes the MLT distribution of different types of events more uniform. This fact may indicate existence of the multi-layer structure of currents and consequently medium scale electric fields, in which the maximum currents considerably exceed the average values observed in the Region 1 and 2. |