Diverse properties of electron Forbush decreases revealed by the Dark Matter Particle Explorer

Abstract

The Forbush decrease (FD) of cosmic rays is an important probe of the interplanetary environment disturbed by solar activities. In this work, we study the properties of 8 FDs electrons (including positrons) between 2 GeV and 20 GeV from January, 2016 to March, 2024, with the Dark Matter Particle Explorer. The maximum decrease amplitudes of these events are about 30% - 15%, and the amplitudes reduce with energy. The recovery time of these events shows diverse behaviors of their energy-dependence. Some of them show strong energy-dependence, while some have a nearly constant recovery time. It has been shown that such diverse behaviors could be related with the geometry of the disturbed regions of the interplanetary space by coronal mass ejections (CME), represented by the combined effect of the CME velocity, angular spread, and ejection direction.

arXiv comment14 pages, 12 figures. Accepted for publication in PRL

References in corpus (12)

• Solar Modulation of Cosmic Rays
• The DArk Matter Particle Explorer mission
• The Plastic Scintillator Detector at DAMPE
• The on-orbit calibration of DArk Matter Particle Explorer
• Charge Measurement of Cosmic Ray Nuclei with the Plastic Scintillator Detector of DAMPE
• Evidence of energy and charge sign dependence of the recovery time for the December 2006 Forbush event measured by the PAMELA experiment
• Measurements of Forbush decreases at Mars: both by MSL on ground and by MAVEN in orbit
• Calibration and performance of the neutron detector onboard of the DAMPE mission
• Forbush decreases and $<$ 2-day GCR flux non-recurrent variations studied with LISA Pathfinder
• Observations of Forbush Decreases of cosmic ray electrons and positrons with the Dark Matter Particle Explorer
• Local interstellar spectra and solar modulation of cosmic ray electrons and positrons
• Monitoring the daily variation of Sun-Earth magnetic fields using galactic cosmic rays