The observation of cosmic ray Helium isotopes at the Earth had been done precisely with the
PAMELA and AMS02 space detectors and reported from July 2006 to December 2007 and from
May 2011 to April 2017, respectively. These available observations span time frames that
include the solar magnetic field reversal epoch. In this work, a comprehensive, threedimensional
numerical modulation model for the transport of cosmic rays in the heliosphere is
utilized to compute the modulation of galactic Helium isotopes from minimum activity in the
previous A < 0 cycle, through solar maximum, and toward minimum activity in the current A > 0
cycle. A particular objective is to reproduce the main features of the 3He2 to 4He2 ratio observed
at rigidities between 2.15 GV and 15.3 GV. We find that the numerical model can reproduce the
apparent single rigidity power law dependence and time dependence of this ratio above 4 GV in
good agreement with observations.
Numerical modeling of the solar modulation of helium isotopes in the inner heliosphere
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Pre-published on:
July 10, 2021
Published on:
March 18, 2022
Abstract
DOI: https://doi.org/10.22323/1.395.1338
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.