Cosmic ray electrons and positrons over decade with the PAMELA experiment

В В Михайлов ,P Papini ,P Picozza ,E Mocchiutti ,Yu I Stozhkov ,S A Voronov ,G C Barbarino ,V Bonvicini ,S V Koldashov ,F Cafagna ,S Y Krutkov ,O Adriani ,G I Vasiliev ,G Castellini ,A Vacchi ,A Bruno ,G Zampa ,E Vannuccini ,P Carlson ,S O Kleymenova ,D Campana ,A N Kvashnin ,G A Bazilevskaya ,N Mori ,É A Bogomolov ,S Ricciarini ,R Munini ,A Monaco ,R Sparvoli ,М Мерге ,S Koldobskiy ,П Спиллантини ,M Martucci ,B Panico ,M Ricci ,M Boezio ,Mark Pearce ,V Malakhov ,M Simon ,A Leonov ,Y T Yurkin ,M Casolino ,R Bellotti ,A V Karelin ,A G Mayorova ,A M Galper ,W Menn ,L Marcelli ,M Bongi ,V Di Felice ,G Osteria ,C De Santis ,N Zampa

doi:10.1088/1742-6596/1390/1/012061

Abstract

The PAMELA experiment has measured cosmic ray particles and antiparticles fluxes at Earth orbit from June 2006 till January 2016 onboard the Resurs-DK1 satellite. Measurements were carried out during the solar minimum of 23 solar cycle with negative polarity A < 0 of heliospheric magnetic field till the beginning of 24 cycle with positive polarity A > 0. In this paper, the results of observations of electron and positron fluxes are presented in wide energy range from several hundreds MeVs till several TeVs These measurements provide important information to study cosmic ray sources and propagation in Galaxy and heliosphere.

Highlights

The magnetic spectrometer PAMELA was launched onboard the Resurs-DK1 satellite on the 15th of June 2006 and it was continuously taking data during almost 3200 days till January 2016
Measurements of the ratio of the fluxes of positrons to the total flux of electrons and positrons in the PAMELA experiment [1], confirmed by subsequent data from FERMI-LAT and AMS02 [2, 3] showed that it increases with energy, starting from 5 GeV in contradiction to the ”standard” diffusion model of the generation and propagation of cosmic rays
At low energies E < 5 GeV, the PAMELA experiment obtained the ratio of the flux of positrons to the total flux of electrons and positrons Ie+/I(e++e−) is noticeably lower than in previous stratospheric measurements carried out in the period of the positive polarity of the interplanetary magnetic field A > 0 in the 80-90 years [5]

Summary

Introduction

The magnetic spectrometer PAMELA was launched onboard the Resurs-DK1 satellite on the 15th of June 2006 and it was continuously taking data during almost 3200 days till January 2016. During in the in PAMELA experiment measurements in 2006-2015, a change in the ratio of positrons and electrons fluxes was observed in 2013-2014.

Results

Conclusion