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Evidence for departure from a power-law flare size distribution for a small solar active region View all abstracts by submitter

Mike Wheatland   Submitted: 2010-01-09 17:46

Active region 11029 was a small, highly flare-productive solar active region observed at a time of extremely low solar activity. The region produced only small flares: the largest of the >70 Geostationary Observational Environmental Satellite (GOES) events for the region has a peak 1-8mbox{AA} flux of 2.2 imes 10-6,{ m W},{ m m}-2 (GOES C2.2). The background-subtracted GOES peak-flux distribution suggests departure from power-law behavior above 10-6,{ m W},{ m m}-2, and a Bayesian model comparison strongly favors a power-law plus rollover model for the distribution over a simple power-law model. The departure from the power law is attributed to this small active region having a finite amount of energy. The rate of flaring in the region varies with time, becoming very high for two days coinciding with the onset of an increase in complexity of the photospheric magnetic field. The observed waiting-time distribution for events is consistent with a piecewise-constant Poisson model. These results present challenges for models of flare statistics and of energy balance in solar active regions.

Authors: M.S. Wheatland
Projects: None

Publication Status: Accepted by ApJ (9 Jan 2010)
Last Modified: 2010-01-11 13:37
Go to main E-Print page  Physics of Solar Prominences: I - Spectral Diagnostics and Non-LTE Modelling  Geometric Triangulation of Imaging Observations to Track Coronal Mass Ejections Continuously Out to 1 AU  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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