Jul 12 – 23, 2021
Online
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A full solar cycle of proton and helium measurements

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

07

Talk SH | Solar & Heliospheric Discussion

Speaker

Nadir Marcelli (INFN sezione di Roma)

Description

Time-dependent energy spectra of galactic cosmic rays (GCRs) carry fundamental information regarding their origin and propagation. When observed at the Earth, these spectra are significantly affected by the solar wind and the imbedded solar magnetic field that permeates the heliosphere, changing significantly over an 11-year solar cycle. Energy spectra of GCRs measured during different epochs of solar activity provide crucial information for a thorough understanding of solar and heliospheric phenomena. The PAMELA experiment had collected data for almost ten years (15 June 2006 - 23 January 2016), including the minimum phase of solar cycle 23 and the maximum phase of solar cycle 24. Here, we present spectra for protons and helium nuclei measured by the PAMELA instrument from 2006 to 2014. Time profiles of the proton-to-helium flux ratio at various rigidities are also presented, allowing the study of all characteristic features resulting from their different mass-to-charge ratio and the difference in the shape of their respective local interstellar spectra.

Subcategory Experimental Results

Primary authors

Nadir Marcelli (INFN sezione di Roma) Dr Mirko Boezio (INFN, Sezione di Trieste, I-34149 Trieste, Italy) Dr Riccardo Munini (INFN, Sezione di Trieste, I-34149 Trieste, Italy) Alex Lenni (INFN sezione di Trieste) Donald Ngobeni (North-West University) 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) Prof. Marius Potgieter (Retired: FS4, Potchefstroom, South Africa)

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