The differential intensities of Cosmic Rays at Earth were calculated using a 2D stochastic Monte carlo diffusion code and compared with observation data. We evaluated the effect of stretched and compressed heliospheres on the Cosmic Ray intensities at the Earth. This was studied introducing a dependence of the diffusion parameter on the heliospherical size. Then, we found that the optimum value of the heliospherical radius better accounting for experimental data. We also found that the obtained values depends on solar activity. Our results are compatible with Voyager observations and with models of heliospherical size modulation.
Bobik, P., Boschini, M., Consolandi, C., Della Torre, S., Gervasi, M., Grandi, D., et al. (2012). Heliosphere dimension and cosmic ray modulation. In Proceedings of the 13th ICATPP Conference "Astroparticle, Particle, Space Physics and Detectors for Physics Applications" (pp.249-257). World Scientific Publishing Co. Pte Ltd [10.1142/9789814405072_0037].
Heliosphere dimension and cosmic ray modulation
Consolandi, C;Della Torre, S;Gervasi, M;Grandi, D;Pensotti, S;Rozza, D
2012
Abstract
The differential intensities of Cosmic Rays at Earth were calculated using a 2D stochastic Monte carlo diffusion code and compared with observation data. We evaluated the effect of stretched and compressed heliospheres on the Cosmic Ray intensities at the Earth. This was studied introducing a dependence of the diffusion parameter on the heliospherical size. Then, we found that the optimum value of the heliospherical radius better accounting for experimental data. We also found that the obtained values depends on solar activity. Our results are compatible with Voyager observations and with models of heliospherical size modulation.
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