Publication Date:
2012
Short description:
Effects of solar modulation on the cosmic ray positron fraction / Della Torre, S; Bobik, P; Boschini, M; Consolandi, C; Gervasi, M; Grandi, D; Kudela, K; Pensotti, S; Rancoita, P; Rozza, D; Tacconi, M. - In: ADVANCES IN SPACE RESEARCH. - ISSN 0273-1177. - 49:11(2012), pp. 1587-1592. [10.1016/j.asr.2012.02.017]
abstract:
We implemented a 2D Monte Carlo model to simulate the solar modulation of galactic cosmic rays. The model is based on the Parker’s
transport equation which contains diffusion, convection, particle drift and energy loss. Following the evolution in time of the solar
activity, we are able to modulate a local interstellar spectrum (LIS), that we assumed isotropic beyond the termination shock, down to
the Earth position inside the heliosphere. In this work we focused our attention to the cosmic ray positron fraction at energy below
10 GeV, showing how the particle drift processes could explain different results for AMS-01 and PAMELA. We compare our modulated
spectra with observations at Earth, and then make a prediction of the cosmic ray positron fraction for the AMS-02 experiment.
transport equation which contains diffusion, convection, particle drift and energy loss. Following the evolution in time of the solar
activity, we are able to modulate a local interstellar spectrum (LIS), that we assumed isotropic beyond the termination shock, down to
the Earth position inside the heliosphere. In this work we focused our attention to the cosmic ray positron fraction at energy below
10 GeV, showing how the particle drift processes could explain different results for AMS-01 and PAMELA. We compare our modulated
spectra with observations at Earth, and then make a prediction of the cosmic ray positron fraction for the AMS-02 experiment.
Iris type:
1.1 Articolo in rivista
Keywords:
Heliosphere; Cosmic ray; Solar modulation; Leptons
List of contributors:
Della Torre, S; Bobik, P; Boschini, M; Consolandi, C; Gervasi, M; Grandi, D; Kudela, K; Pensotti, S; Rancoita, P; Rozza, D; Tacconi, M
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