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Comparison and Time Evolution of the Geomagnetic Cutoff at the ISS Position: Internal vs External Earth’s Magnetic Field Models

Published online by Cambridge University Press:  24 July 2018

Matteo J. Boschini ,
Stefano Della Torre Open the ORCID record for Stefano Della Torre [Opens in a new window] ,
Massimo Gervasi ,
Davide Grandi ,
Giuseppe La Vacca ,
Simonetta Pensotti ,
Pier Giorgio Rancoita ,
Davide Rozza Open the ORCID record for Davide Rozza [Opens in a new window]  and
Mauro Tacconi
Matteo J. Boschini
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Cineca, Segrate, Italy
Stefano Della Torre
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected]
Massimo Gervasi
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
Davide Grandi
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
Giuseppe La Vacca
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
Simonetta Pensotti
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
Pier Giorgio Rancoita
Affiliation:
Cineca, Segrate, Italy
Davide Rozza
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
Mauro Tacconi
Affiliation:
INFN Sezione di Milano Bicocca, I-20126 Milano, Italy email: [email protected] Università degli Studi di Milano Bicocca, I-20126 Milano, Italy
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Abstract

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Our back-tracing code (GeoMagSphere) reconstructs the cosmic ray trajectories inside the Earth’s magnetosphere. GeoMagSphere gets the incoming directions of particles entering the magnetopause and disentangles primary from secondary particles (produced in atmosphere) or even particles trapped inside the Earth’s magnetic field. The separation of these particle families allows us to evaluate the geomagnetic rigidity cutoff. The model can be used considering the internal symmetric (IGRF-12) magnetic field only, or adding the asymmetric external one (Tsyganenko models: T89, T96 or TS05). A quantitative comparison among these models is presented for quiet (solar pressure Pdyn < 4 nPa) and disturbed (Pdyn > 4 nPa) periods of solar activity, as well as during solar events like flares, CMEs. In this analysis we focused our attention on magnetic field data in magnetosphere, from Cluster, and simulated cosmic rays for a generic detector on the ISS as for example AMS-02. We found that high solar activity periods, like a large fraction of the period covering years 2011-2015, are better described using IGRF+TS05 model. Results, i.e. the average vertical rigidity cutoff at the ISS orbit, are shown in geographic maps of 2° × 2° cells.

Keywords

Cosmic raysEarth’s magnetic fieldsSun activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 105 - 108
Copyright
Copyright © International Astronomical Union 2018 

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