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25 Years of Self-Organized Criticality: Solar and Astrophysics View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2014-03-25 16:18

Shortly after the seminal paper ``Self-Organized Criticality: An explanation of 1/f noise'' by Bak, Tang, and Wiesenfeld (1987), the idea has been applied to solar physics, in``Avalanches and the Distribution of Solar Flares'' by Lu and Hamilton (1991). In the following years, an inspiring cross-fertilization from complexity theory to solar and astrophysics took place, where the SOC concept was initially applied to solar flares, stellar flares, and magnetospheric substorms, and later extended to the radiation belt, the heliosphere, lunar craters, the asteroid belt, the Saturn ring, pulsar glitches, soft X-ray repeaters, blazars, black-hole objects, cosmic rays, and boson clouds. The application of SOC concepts has been performed by numerical cellular automaton simulations, by analytical calculations of statistical (powerlaw-like) distributions based on physical scaling laws, and by observational tests of theoretically predicted size distributions and waiting time distributions. Attempts have been undertaken to import physical models into the numerical SOC toy models, such as the discretization of magneto-hydrodynamics (MHD) processes. The novel applications stimulated also vigorous debates about the discrimination between SOC models, SOC-like, and non-SOC processes, such as phase transitions, turbulence, random-walk diffusion, percolation, branching processes, network theory, chaos theory, fractality, multi-scale, and other complexity phenomena. We review SOC studies from the last 25 years and highlight new trends, open questions, and future challenges, as discussed during two recent ISSI workshops on this theme.

Authors: Aschwanden, M.J., Crosby, N., Dimitropoulou, M., Geogoulis, M.K., Hergarten, S., McAteer, J., Milovanov, A.V., Mineshige, S., Morales, L., Nishizuka, N., Pruessner, G., Sanchez, R., Sharma, S., Strugarek, A., and Uritsky, V.
Projects: None

Publication Status: Space Science Reviews (subm. March 24, 2014)
Last Modified: 2014-03-26 12:35
Go to main E-Print page  Observations of linear polarization in a solar coronal loop prominence system near 6173 A  Magnetic helicity and energy spectra of a solar active region  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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