Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 42, issue 1
Articles | Volume 42, issue 1
https://doi.org/10.5194/angeo-42-163-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-42-163-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 42, issue 1
Regular paper
 | 
27 May 2024
Regular paper |  | 27 May 2024

Permutation entropy and complexity analysis of large-scale solar wind structures and streams

Emilia K. J. Kilpua, Simon Good, Matti Ala-Lahti, Adnane Osmane, and Venla Koikkalainen

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Cited articles

Balasis, G., Daglis, I. A., Kapiris, P., Mandea, M., Vassiliadis, D., and Eftaxias, K.: From pre-storm activity to magnetic storms: a transition described in terms of fractal dynamics, Ann. Geophys., 24, 3557–3567, https://doi.org/10.5194/angeo-24-3557-2006, 2006. a, b
Balasis, G., Balikhin, M. A., Chapman, S. C., Consolini, G., Daglis, I. A., Donner, R. V., Kurths, J., Paluš, M., Runge, J., Tsurutani, B. T., Vassiliadis, D., Wing, S., Gjerloev, J. W., Johnson, J., Materassi, M., Alberti, T., Papadimitriou, C., Manshour, P., Boutsi, A. Z., and Stumpo, M.: Complex Systems Methods Characterizing Nonlinear Processes in the Near-Earth Electromagnetic Environment: Recent Advances and Open Challenges, Space Sci. Rev., 219, 38, https://doi.org/10.1007/s11214-023-00979-7, 2023. a
Bandt, C. and Pompe, B.: Permutation Entropy: A Natural Complexity Measure for Time Series, Phys. Rev. Lett., 88, 174102, https://doi.org/10.1103/PhysRevLett.88.174102, 2002. a, b
Belcher, J. W. and Davis, Leverett, J.: Large-amplitude Alfvén waves in the interplanetary medium, 2, J. Geophys. Res., 76, 3534, https://doi.org/10.1029/JA076i016p03534, 1971. a, b
Borovsky, J. E. and Funsten, H. O.: Role of solar wind turbulence in the coupling of the solar wind to the Earth's magnetosphere, J. Geophys. Res., 108, 1246, https://doi.org/10.1029/2002JA009601, 2003. a
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The solar wind is organised into slow and fast streams, interaction regions, and transient structures originating from solar eruptions. Their internal characteristics are not well understood. A more comprehensive understanding of such features can give insight itno physical processes governing their formation and evolution. Using tools from information theory, we find that the solar wind shows universal turbulent properties on smaller scales, while on larger scales, clear differences arise. 
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