On the Influence of the Geomagnetic Field Geometry on the Propagation of Charged Energetic Particles

Details On the Influence of the Geomagnetic Field Geometry on the Propagation of Charged Energetic Particles On the Influence of the Geomagnetic Field Geometry on the Propagation of Charged Energetic Particles

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm12a..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM12A-06

Physics

[1517] Geomagnetism And Paleomagnetism / Magnetic Anomalies: Modeling And Interpretation, [1555] Geomagnetism And Paleomagnetism / Time Variations: Diurnal To Decadal, [2104] Interplanetary Physics / Cosmic Rays, [2716] Magnetospheric Physics / Energetic Particles: Precipitating

Scientific paper

Studies of the propagation of charged energetic particles in the Earth's magnetic field go back to Carl Størmer, who introduced ''allowed'' and ''forbidden'' regions on the Earth's surface, leading finally to the definition of the cutoff rigidity, i.e. the minimum momentum per charge a particle must have in order to reach a certain geographical point. Employing Monte Carlo Simulations with the PLANETOCOSMICS code we investigate the correlation between the geomagnetic field structure and the (vertical) cutoff rigidity. It turns out that the resulting rigidity maps reflect the geometry of the field, rather than its magnitude, where the field geometry is represented by the difference between the tangential and the radial components. In order to support our findings we also investigate the temporal variation of both quantities over the last century.

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