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Self-organized criticality in stellar flares View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2021-06-11 12:41

Power law size distributions are the hallmarks of nonlinear energy dissipation processes governed by self-organized criticality. Here we analyze 75 data sets of stellar flare size distributions, mostly obtained from the Extreme Ultra-Violet Explorer (EUVE) and the Kepler mission. We aim to answer the following questions for size distributions of stellar flares: (i) What are the values and uncertainties of power law slopes? (ii) Do power law slopes vary with time ? (iii) Do power law slopes depend on the stellar spectral type? (iv) Are they compatible with solar flares? (v) Are they consistent with self- organized criticality (SOC) models? We find that the observed size distributions of stellar flare fluences (or energies) exhibit power law slopes of αE = 2.09 0.24 for optical data sets observed with Kepler. The observed power law slopes do not show much time variability and do not depend on the stellar spectral type (M, K, G, F, A, Giants). In solar flares we find that background subtraction lowers the uncorrected value of αE = 2.20 0.22 to αE = 1.57 0.19. Furthermore, most of the stellar flares are temporally not resolved in low-cadence (30 min) Kepler data, which causes an additional bias. Taking these two biases into account, the stellar flare data sets are consistent with the theoretical prediction N(x) ∝ x-αx of self-organized criticality models, i.e., αE = 1.5. Thus, accurate power law fits require automated detection of the inertial range and background subtraction, which can be modeled with the generalized Pareto distribution, finite-system size effects, and extreme event outliers.

Authors: Aschwanden, M.J.and Guedel, M.
Projects: None

Publication Status: Aschwanden,M.J. and Guedel,M. 2021, ApJ 910:41
Last Modified: 2021-06-12 00:56
Go to main E-Print page  Correlation of the sunspot number and the waiting time distribution of solar flares, coronal mass ejections, and solar wind switchback events observed with the Parker Solar Probe  Finite system-size effectrs in self-organizing criticality systems  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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