The Southern African neutron monitor program: A regional network to study global cosmic ray modulation

Moloto, K.D.; Engelbrecht, N. E.; Strauss, R. D.; Diedericks, Corrie

doi:10.1016/j.asr.2022.05.044

Advances in Space Research

2023

DOI: 10.1016/j.asr.2022.05.044

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The Southern African neutron monitor program: A regional network to study global cosmic ray modulation

K.D. Moloto¹,

N. E. Engelbrecht²,

R. D. Strauss³

et al.

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2024

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The Diffusion Tensor of Protons at 1 au: Comparing Simulation, Observation, and Theory

Els,

Engelbrecht,

Lang

et al. 2024

ApJ

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The natural variation in plasma parameters observed at 1 au can lead to a variation in transport parameters, such as diffusion and drift coefficients, for energetic charged particles of solar and galactic origin. Given the importance of these parameters to particle transport studies, this variation is investigated through test particle simulations over a range of energies in the presence of simulated turbulence with properties corresponding to an ensemble of observed turbulence conditions at Earth. The resulting transport coefficients are then compared with observational estimates from the literature, as well as the predictions of several scattering theories. Parallel and perpendicular mean free paths are shown to vary widely, for the former in agreement with prior observational estimates, but not for the latter. Furthermore, a large disparity between the predictions of theory and the simulation results is noted for the perpendicular mean free path. As such, these results indicate that particle transport studies, particularly predictive ones, need to take into account this natural variation in transport coefficients.

show abstract

The Diffusion Tensor of Protons at 1 au: Comparing Simulation, Observation, and Theory

Els,

Engelbrecht,

Lang

et al. 2024

ApJ

View full text Add to dashboard Cite

show abstract

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The Southern African neutron monitor program: A regional network to study global cosmic ray modulation

Cited by 1 publication

References 134 publications

The Diffusion Tensor of Protons at 1 au: Comparing Simulation, Observation, and Theory

The Diffusion Tensor of Protons at 1 au: Comparing Simulation, Observation, and Theory

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