Jul 12 – 23, 2021
Europe/Berlin timezone

Galactic Cosmic-Ray Intensities During three Solar Minima

Jul 14, 2021, 12:00 PM
1h 30m


Talk SH | Solar & Heliospheric Discussion


Dr Richard Mewaldt (California Institute of Technology)


The Cosmic-Ray Isotope (CRIS) and Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer(ACE) have measured energy spectra of cosmic-ray elements and isotopes since launch in 1997. We report energy spectra of abundant elements from C to Ni during solar minimum conditions from the 1997, 2009, and 2019-2020 solar minima and compare peak intensities with solar-wind conditions in these 3 minima. In 2010 we reported that peak intensities from the 2009 solar minimum were the highest of the space era (coinciding with the weakest interplanetary magnetic field of the space era). During Nov.2019-January 2020 ACE data show 200 MeV/nuc intensities of C-Fe reached, and in some cases exceeded those in 2009.This talk reports GCR intensities from 1997-2021 and discusses their dependence on solar-wind properties.


GCR Energy Spectra, Solar minimum Peak GCR Intensities,
Discussion of solar modulation Effects

other Collaboration ACE GCR Team
Subcategory Experimental Results
Collaboration other (fill field below)

Primary author

Dr Richard Mewaldt (California Institute of Technology)

Presentation materials