Jul 12 – 23, 2021
Online
Europe/Berlin timezone

Combined heliospheric modulation of galactic protons and helium nuclei from solar minimum to maximum activity related to observations by PAMELA.

Jul 14, 2021, 12:00 PM
1h 30m
07

07

Talk 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 global features of the modulation of galactic cosmic ray protons and helium nuclei are studied in the heliosphere from solar minimum to maximum activity with a comprehensive, three-dimensional, drift model and compared to proton and helium observations measured by PAMELA from 2006 to 2014. Combined with accurate very local interstellar spectra (VLIS) for protons and helium nuclei, this provides the opportunity to study in detail how differently the proton to helium ratio, over a wide range of rigidities, behaves towards increasing solar activity. In particular, the effects at the Earth of the difference in their VLIS’s, mass-to-charge ratio (A/Z) and those caused by the main modulation mechanisms will be illustrated from solar minimum to maximum activity.

Keywords

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

Subcategory Theoretical Results

Primary author

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)

Co-authors

Dr O.P.M Aslam (Centre for Space Research, North-West University, Potchefstroom, South Africa) Dr Driaan Bisschoff (Centre for Space Research, North-West University, Potchefstroom, South Africa) Dr Chris Ndiitwani (1. Centre for Space Research, North-West University, Potchefstroom, South Africa; 2.School of Physical & Chemical Sciences, North-West University, Mmabatho, South Africa) Prof. Marius Potgieter (Retired: FS4, Potchefstroom, South Africa) Dr Mirko Boezio (INFN, Sezione di Trieste, I-34149 Trieste, Italy) Mr Nadir Marcelli (INFN, Sezione di Rome, I-00133 Rome, Italy) Dr Riccardo Munini (INFN, Sezione di Trieste, I-34149 Trieste, Italy) Prof. Vladimir Mikhailov (National Research Nuclear University MEPHI, RU-115409 Moscow, Russia)

Presentation materials