Abstract
Motion of charged particles in an inhomogeneous turbulent medium as magnetic field is described by partial differential equations of the Fokker-Planck-Kolmogorov type. We present an algorithm of numerical solution of the four-dimensional Fokker-Planck equation in three-dimensional spherical coordinates system. The algorithm is based on Monte Carlo simulations of the stochastic motion of quasi-particles guided by the set of stochastic differential equations corresponding to the Fokker-Planck equation by the Ito formalism. We present the parallel algorithm in Julia programming language. We simulate the transport of cosmic rays in the heliosphere considering the full three-dimensional diffusion tensor. We compare forward- and backward-in-time solutions of the transport equation and discuss its computational advantages and disadvantages.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Fokker, D.: Die mittlere Energie rotierender elektrischer Dipole im Strahlungsfeld. Ann. Phys. 348, 810–820 (1914)
Planck, M.: An essay on statistical dynamics and its amplification in the quantum theory. Sitzber. Preuss. Akad. Wiss. 325, 324 (1917)
Parker, E.: The passage of energetic charged particles through interplanetary space. Planet. Space Sci. 13, 9–49 (1965)
Chandrasekhar, S.: Stochastic problems in physics and astronomy. Rev. Mod. Phys. 15, 1–89 (1943)
Gardiner, C.W.: Handbook of stochastic methods for physics, chemistry and the natural sciences. Springer Series in Synergetics. Springer, Heidelberg (2009)
Moraal, H.: Cosmic-ray modulation equations. Space Sci. Rev. 176, 299–319 (2013)
Gervasi, M., Rancoita, P.G., Usoskin, I.G., Kovaltsov, G.A.: Monte-Carlo approach to galactic cosmic ray propagation in the heliosphere. Nucl. Phys. B (Proc. Suppl.) 78, 26–31 (1999)
Alania, M.V.: Stochastic variations of galactic cosmic rays. Acta Physica Pol. B 33(4), 1149–1166 (2002)
Zhang, M.: A markov stochastic process theory of cosmic-ray modulation. Astrophys. J. 513, 409–420 (1999)
Pei, C., Bieber, J.W., Burger, R.A., Clem, J.: A general time-dependent stochastic method for solving Parker’s transport equation in spherical coordinates. J. Geophys. Res. 115, A12107 (2010)
Vos, E., Potgieter, M.S.: New modeling of galactic proton modulation during the minimum of solar cycle 23/24. Astrophys. J., 815, article id. 119, 8 pp. (2015)
Bobik, P., Boschini, M.J., Della Torre, S., et al.: On the forward-backward-in-time approach for Monte Carlo solution of Parker’s transport equation: one-dimensional case. J. Geophys. Res. Space Phys. 121, 3920–3930 (2016)
Kopp, A., Busching, I., Strauss, R.D., Potgieter, M.S.: A stochastic differential equation code for multidimensional Fokker-Planck type problems. Comput. Phys. Commun. 183, 530–542 (2012)
Wawrzynczak, A., Modzelewska, R., Gil, A.: Stochastic approach to the numerical solution of the non-stationary Parker’s transport equation. J. Phys. Conf. Ser. 574, 012078 (2015)
Kloeden, P.E., Platen, E., Schurz, H.: Numerical Solution of SDE Through Computer Experiments. Springer, Heidelberg (2003). https://doi.org/10.1007/978-3-642-57913-4
Wawrzynczak, A., Modzelewska, R., Kluczek, M.: Numerical methods for solution of the stochastic differential equations equivalent to the non-stationary Parkers transport equation. J. Phys. Conf. Ser. 633, 012058 (2015)
Wawrzynczak, A., Modzelewska, R., Gil, A.: A stochastic method of solution of the Parker transport equation. J. Phys. Conf. Ser. 632, 1742–6596 (2015)
Acknowledgments
This work is supported by The Polish National Science Centre grant awarded by decision number DEC-2012/07/D/ST6/02488. Calculations were performed at the Interdisciplinary Centre for Mathematical and Computational Modelling (ICM) at Warsaw University within the computational grant no. G66-19.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG, part of Springer Nature
About this paper
Cite this paper
Wawrzynczak, A., Modzelewska, R., Gil, A. (2018). Algorithms for Forward and Backward Solution of the Fokker-Planck Equation in the Heliospheric Transport of Cosmic Rays. In: Wyrzykowski, R., Dongarra, J., Deelman, E., Karczewski, K. (eds) Parallel Processing and Applied Mathematics. PPAM 2017. Lecture Notes in Computer Science(), vol 10777. Springer, Cham. https://doi.org/10.1007/978-3-319-78024-5_2
Download citation
DOI: https://doi.org/10.1007/978-3-319-78024-5_2
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-78023-8
Online ISBN: 978-3-319-78024-5
eBook Packages: Computer ScienceComputer Science (R0)