Power Laws in Solar Flares: Self-Organized Criticality or Turbulence?

Details Power Laws in Solar Flares: Self-Organized Criticality or Turbulence? Power Laws in Solar Flares: Self-Organized Criticality or Turbulence?

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvl..83.4662b&link_type=abstract

Physical Review Letters, Volume 83, Issue 22, November 29, 1999, pp.4662-4665

Statistics

157

Scientific paper

The statistics of quiescent times τL between successive bursts of solar flares activity, performed using 20 years of data, displays a power law distribution with exponent α~=2.4. This is an indication of an underlying complex dynamics with long correlation times. The observed scaling behavior is in contradiction with the self-organized criticality models of solar flares which predict Poisson-like statistics. Chaotic models, including the destabilization of the laminar phases and subsequent restabilization due to nonlinear dynamics, are able to reproduce the power law for the quiescent times. A shell model of MHD turbulence correctly reproduces all the observed distributions.

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