Selected Cosmic-Ray Orbits in the Earth's Magnetic Field

1956 ◽  
Vol 103 (4) ◽  
pp. 1068-1075 ◽  
Author(s):  
F. S. Jory
Keyword(s):  
Magnetic Field ◽  
Cosmic Ray ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

Determination of the effective charge of solar cosmic-ray nuclei using the Earth's magnetic field

1984 ◽  
Vol 4 (2-3) ◽  
pp. 169-172
Author(s):  
S. Fischer ◽  
M. Vandas ◽  
K. Kudela ◽  
S.N. Kuznetsov ◽  
V.N. Lutsenko
Keyword(s):  
Magnetic Field ◽  
Effective Charge ◽  
Cosmic Ray ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

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

2017 ◽  
Vol 13 (S335) ◽  
pp. 105-108
Author(s):  
Matteo J. Boschini ◽  
Stefano Della Torre ◽  
Massimo Gervasi ◽  
Davide Grandi ◽  
Giuseppe La Vacca ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Activity ◽  
Large Fraction ◽  
Cosmic Ray ◽  
High Solar Activity ◽  
Earth’S Magnetic Field ◽  
Magnetic Field Data ◽  
Geomagnetic Cutoff ◽  
Earth's Magnetic Field ◽  
Ray Trajectories

AbstractOur 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.

scholarly journals Influence of the terrestrial magnetic field geometry on the cutoff rigidity of cosmic ray particles

2013 ◽  
Vol 31 (10) ◽  
pp. 1637-1643 ◽  
Author(s):  
K. Herbst ◽  
A. Kopp ◽  
B. Heber
Keyword(s):  
Magnetic Field ◽  
Geographical Location ◽  
Cosmic Ray ◽  
Virgin Islands ◽  
Cutoff Rigidity ◽  
Earth’S Magnetic Field ◽  
Simple Geometry ◽  
Earth's Magnetic Field ◽  
Field Geometry ◽  
Definition Of

Abstract. Studies of the propagation of charged energetic particles in the Earth's magnetic field go back to Carl Størmer. In the end, his investigations finally lead to the definition of the so-called cutoff rigidity RC; that is, the minimum momentum per charge a particle must have in order to reach a certain geographical location. Employing Monte Carlo simulations with the PLANETOCOSMICS code we investigate the correlation between the geomagnetic field structure and the cutoff rigidity. We show that the geometry of the magnetic field has a considerable influence on the resulting cutoff rigidity distribution. Furthermore, we will present a simple geometry-based parameter, δB, which is able to reflect the location-dependent cutoff rigidity. We show that this correlation is also visible in the temporal evolution of the Earth's magnetic field, at least over the last 100 yr. Using latitude scans with neutron monitors, changes of the relative counting rates at different positions are calculated, showing small variations for, e.g., Kiel and Moscow, while large ones occur at Mexico City as well as on the British Virgin Islands.

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