Observations of Forbush Decreases of cosmic ray electrons and positrons with the Dark Matter Particle Explorer

Abstract

The Forbush Decrease (FD) represents the rapid decrease of the intensities of charged particles accompanied with the coronal mass ejections (CMEs) or high-speed streams from coronal holes. It has been mainly explored with ground-based neutron monitors network which indirectly measure the integrated intensities of all species of cosmic rays by counting secondary neutrons produced from interaction between atmosphere atoms and cosmic rays. The space-based experiments can resolve the species of particles but the energy ranges are limited by the relative small acceptances except for the most abundant particles like protons and helium. Therefore, the FD of cosmic ray electrons and positrons have just been investigated by the PAMELA experiment in the low energy range ($<5$ GeV) with limited statistics. In this paper, we study the FD event occurred in September, 2017, with the electron and positron data recorded by the Dark Matter Particle Explorer. The evolution of the FDs from 2 GeV to 20 GeV with a time resolution of 6 hours are given. We observe two solar energetic particle events in the time profile of the intensity of cosmic rays, the earlier and weak one has not been shown in the neutron monitor data. Furthermore, both the amplitude and recovery time of fluxes of electrons and positrons show clear energy-dependence, which is important in probing the disturbances of the interplanetary environment by the coronal mass ejections.

This article is dedicated to the 72nd anniversary of People's Republic of China

References in corpus (5)

• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• The DArk Matter Particle Explorer mission
• The on-orbit calibration of DArk Matter Particle Explorer
• Calibration and performance of the neutron detector onboard of the DAMPE mission
• Local interstellar spectra and solar modulation of cosmic ray electrons and positrons

Cited by in corpus (7)

• Detection of spectral hardenings in cosmic-ray boron-to-carbon and boron-to-oxygen flux ratios with DAMPE
• Unfolding Drift Effects for Cosmic Rays over the Period of the Sun's Magnetic Field Reversal
• An Unsupervised Machine Learning Method for Electron--Proton Discrimination of the DAMPE Experiment
• PSF Calibration of DAMPE for gamma-ray Observations
• Determination of the absolute energy scale of the DAMPE calorimeter with the geomagnetic rigidity cutoff method
• Diverse properties of electron Forbush decreases revealed by the Dark Matter Particle Explorer
• Measurements of Cosmic Proton Flux through Neutron Monitors Using Deep Networks and Imputation Techniques in the AMS-02 Era