# Secondary positrons and electrons measured by PAMELA experiment

## TL;DR

This paper reports measurements of secondary electron and positron fluxes in near-Earth space by the PAMELA satellite, analyzing their spatial distributions and origins in cosmic ray interactions.

## Contribution

It provides detailed measurements of secondary particles below the geomagnetic cutoff, including their spatial distribution and production mechanisms, using the PAMELA spectrometer.

## Key findings

- Secondary electrons and positrons are measured across a wide energy range.
- Spatial distributions reveal features like the South Atlantic Anomaly.
- Trajectories distinguish trapped and albedo components.

## Abstract

We present a measurements of electron and positron fluxes below the geomagnetic cutoff rigidity in wide energy range from 50 MeV to several GeV by the PAMELA magnetic spectrometer. The instrument was launched on June 15th 2006 on-board the Resurs-DK satellite on low orbit with 70 degrees inclination and altitude between 350 and 600 km. The procedure of trajectories calculations in the geomagnetic field separates stably trapped and albedo components produced in interactions of cosmic ray protons with the residual atmosphere from galactic cosmic rays. Features of spatial distributions of secondary electrons and positrons in the near Earth space, including the South Atlantic Anomaly, were investigated.