ICRC 2021

Numerical modeling of the solar modulation of helium isotopes in the inner heliosphere

16 Jul 2021, 18:00

1h 30m

TBA

Poster SH | Solar & Heliospheric Discussion

Speaker

Dr Donald Ngobeni (1. Centre for Space Research, North-West University, Potchefstroom, South Africa; 2. School of Physical & Chemical Sciences, North-West University, Mmabatho, South Africa)

Description

The observation of cosmic ray Helium isotopes (Helium-3 and Helium-4) at the Earth had been done with the PAMELA and AMS-02 space detectors, from July 2006 to December 2007 and May 2011 to November 2017, respectively. These available observations span time frames that include the solar magnetic field reversal epoch. In this work, a comprehensive, three-dimensional numerical modulation model for the transport of cosmic rays in the heliosphere is utilized to compute the modulation of galactic Helium isotopes from minimum to maximum solar activity. The computed ratio of Helium-3 to Helium-4 is compared with the observed ratio from PAMELA and AMS-02 taken between 2006 and 2017. It will be shown how the rigidity and time dependence of this ratio depends on the level of solar activity and what the underlying physics is for this behaviour

Keywords

Cosmic rays · Heliosphere · Solar modulation ·
Solar activity · Galactic helium isotopes

Presentation materials

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