Local interstellar spectra and solar modulation of cosmic ray electrons and positrons

Abstract

Low energy cosmic rays are modulated by the solar activity when they propagation in the heliosphere, leading to ambiguities in understanding their acceleration at sources and propagation in the Milky Way. By means of the precise measurements of the $e^{-}$, $e^{+}$, $e^{-}+e^{+}$, and $e^{+}/(e^{-}+e^{+})$ spectra by AMS-02 near the Earth, as well as the very low energy measurements of the $e^{-}+e^{+}$ fluxes by Voyager-1 far away from the Sun, we derive the local interstellar spectra (LIS) of $e^{-}$ and $e^{+}$ components individually. Our method is based on a non-parametric description of the LIS of $e^{-}$ and $e^{+}$ and a force-field solar modulation model. We then obtain the evolution of the solar modulation parameters based on the derived LIS and the monthly fluxes of cosmic ray $e^{-}$ and $e^{+}$ measured by AMS-02. {\bf To better fit the monthly data, additional renormalization factors for $e^{-}$ and $e^{+}$ have been multiplied to the modulated fluxes.} We find that the inferred solar modulation parameters of positrons are in good agreement with that of cosmic ray nuclei, and the time evolutions of the solar modulation parameters of electrons and positrons differ after the reversal of the heliosphere magnetic field polarity, which shows clearly the charge-sign dependent modulation effect.

arXiv comment12 pages, 8 figures

References in corpus (33)

• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• Observation of an anomalous positron abundance in the cosmic radiation
• Production and propagation of cosmic-ray positrons and electrons
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Discrepant hardening observed in cosmic-ray elemental spectra
• The cosmic-ray electron flux measured by the PAMELA experiment between 1 and 625 GeV
• The cosmic-ray positron energy spectrum measured by PAMELA
• Time dependence of the proton flux measured by PAMELA during the July 2006 - December 2009 solar minimum
• Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite
• Cosmic-ray electron+positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
• The origin of Galactic cosmic rays: challenges to the standard paradigm
• Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station
• Solution of heliospheric propagation: unveiling the local interstellar spectra of cosmic ray species
• On Polar Magnetic Field Reversal and Surface Flux Transport During Solar Cycle 24
• Time dependence of the e^- flux measured by PAMELA during the July 2006 - December 2009 solar minimum
• Quantitative study of the AMS-02 electron/positron spectra: implications for the pulsar and dark matter properties
• A new universal cosmic-ray knee near the magnetic rigidity 10 TV with the NUCLEON space observatory
• New very local interstellar spectra for electrons, positrons, protons and light cosmic ray nuclei
• Proton fluxes measured by the PAMELA experiment from the minimum to the maximum solar activity for the 24th solar cycle
• Solar Modulation of the Proton Local Interstellar Spectrum with AMS-02, Voyager 1 and PAMELA
• Neutron monitors and muon detectors for solar modulation studies: 2. $\varphi$ time series
• Numerical modeling of galactic cosmic ray proton and helium observed by AMS-02 during the solar maximum of Solar Cycle 24
• Time dependence of the electron and positron components of the cosmic radiation measured by the PAMELA experiment between July 2006 and December 2015
• Cosmic Ray Models
• Evidence for a Time Lag in Solar Modulation of Galactic Cosmic Rays
• HelMod in the works: from direct observations to the local interstellar spectrum of cosmic-ray electrons
• New local interstellar spectra for protons, Helium and Carbon derived from PAMELA and Voyager 1 observations
• SOLARPROP: Charge-sign Dependent Solar Modulation for Everyone
• Testing diffusion of cosmic rays in the heliosphere with proton and helium data from AMS
• Breaks in interstellar spectra of positrons and electrons derived from time-dependent AMS data
• Studies on cosmic ray nuclei with Voyager, ACE and AMS-02: I. local interstellar spectra and solar modulation
• Time-dependent AMS-02 electron-positron fluxes in an extended force-field model
• Time dependent solar modulation of cosmic rays from solar minimum to solar maximum

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• Probing solar modulation of AMS-02 time-dependent D, ${}^3$He and ${}^4$He fluxes with modified force field approximation
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