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• W3031123347 abstract "Abstract We present a 2-dimensional time-dependent simulation based on Parker’s transport equation (PTE) describing the propagation of energetic astroparticles – cosmic rays (CR) in the heliosphere. PTE is a second order partial differential equation containing four major processes: diffusion, convection, drift, and adiabatic cooling responsible for modulation of the CR flux in the heliosphere. We implement in the numerical simulation, a few physical parameters as the tilt angle, $delta $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>δ</mml:mi></mml:math> , of the heliospheric current sheet (HCS), module, $B$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>B</mml:mi></mml:math> , of the interplanetary magnetic field (IMF), and variations of drift effect of the CR particles with solar activity (SA). Our approach is the implementation of two independent parameters (proxies), $gamma $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>γ</mml:mi></mml:math> and $nu $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>ν</mml:mi></mml:math> . The parameters $gamma $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>γ</mml:mi></mml:math> and $nu $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>ν</mml:mi></mml:math> are calculated from various independent sources, $gamma $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>γ</mml:mi></mml:math> , from neutron monitors (NM) daily data, and $nu $ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>ν</mml:mi></mml:math> , using the IMF hourly data. The solutions of PTE obtained from our numerical model are compared with the variations of the CR flux recorded by NMs. We prove the existence of a varying delay time (DT) between the changes of galactic cosmic ray (GCR) intensity and the parameters characterizing SA. Based on our investigation, we obtained different DTs in Solar Cycles 21 and 23. We conclude that the calculated DTs, after comparison with the observed DTs, are useful parameters for the study of GCR transport in the heliosphere." @default.
• W3031123347 created "2020-06-05" @default.
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• W3031123347 date "2020-05-01" @default.
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• W3031123347 title "Modeling the Time Delay Problem of Galactic Cosmic Ray Flux in Solar Cycles 21 and 23" @default.
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• W3031123347 doi "https://doi.org/10.1007/s11207-020-01628-w" @default.
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