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Entropy 2018, 20(8), 622; https://doi.org/10.3390/e20080622

Approximate Bayesian Computation for Estimating Parameters of Data-Consistent Forbush Decrease Model

1
Institute of Computer Sciences, Siedlce University, 08-110 Siedlce, Poland
2
National Centre for Nuclear Research, 05-400 Swierk-Otwock, Poland
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 14 August 2018 / Accepted: 20 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Entropy: From Physics to Information Sciences and Geometry)
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Abstract

Realistic modeling of complex physical phenomena is always quite a challenging task. The main problem usually concerns the uncertainties surrounding model input parameters, especially when not all information about a modeled phenomenon is known. In such cases, Approximate Bayesian Computation (ABC) methodology may be helpful. The ABC is based on a comparison of the model output data with the experimental data, to estimate the best set of input parameters of the particular model. In this paper, we present a framework applying the ABC methodology to estimate the parameters of the model of Forbush decrease (Fd) of the galactic cosmic ray intensity. The Fd is modeled by the numerical solution of the Fokker–Planck equation in five-dimensional space (three spatial variables, the time and particles energy). The most problematic in Fd modeling is the lack of detailed knowledge about the spatial and temporal profiles of the parameters responsible for the creation of the Fd. Among these parameters, the diffusion coefficient plays a central role. We employ the ABC Sequential Monte Carlo algorithm, scanning the space of the diffusion coefficient parameters within the region of the heliosphere where the Fd is created. Assessment of the correctness of the proposed parameters is done by comparing the model output data with the experimental data of the galactic cosmic ray intensity. The particular attention is put on the rigidity dependence of the rigidity spectrum exponent. The proposed framework is adopted to create the model of the Fd observed by the neutron monitors and ground muon telescope in November 2004. View Full-Text
Keywords: modeling of the GCR transport; estimation of the diffusion coefficient parameter; bayesian computations modeling of the GCR transport; estimation of the diffusion coefficient parameter; bayesian computations
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Wawrzynczak, A.; Kopka, P. Approximate Bayesian Computation for Estimating Parameters of Data-Consistent Forbush Decrease Model. Entropy 2018, 20, 622.

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