Secondary electron and positron fluxes in the Earth magnetosphere near the geomagnetic equator

Measurements of electron and positron fluxes in energy range from 80 MeV to several GeV (below the geomagnetic cutoff rigidity) were performed using the PAMELA spectrometer onboard the Resurs-DK satellite. It has been launched on June 15, 2006 on an elliptical orbit (the inclination is 70.4 grad, the altitude is 350-600 km). The main goal of the experiment is precise measurements of an antiparticle component: antiprotons (in energy range 80 MeV-190 GeV) and positrons (in energy range 50 MeV-270 GeV). Particle rigidity, charge and type are determined with the three main detectors of the spectrometer - the silicon tracker with a permanent magnet, the time-of-flight system based on scintillation detector and the electromagnetic calorimeter. The work presents measurements of secondary electrons and positrons in the Equatorial region. These results are particularly interesting for more precise definition of electron/positron flux model in the Earth magnetosphere. (authors)