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Non-Stationary Fast-Driven Self-Organized Criticality in Solar Flares
Markus J. Aschwanden
The original concept of self-organized criticality (Bak et al.~1987), applied to solar flare statistics (Lu and Hamilton 1991), assumed a slow-driven and stationary flaring rate, w…
Global Energetics of Solar Flares. IX. Refined Magnetic Modeling
Markus J. Aschwanden
A more accurate analytical solution of the {\sl vertical-current approximation nonlinear force-free field (VCA3-NLFFF)} model is presented that includes besides the radial …
Self-Organized Criticality in Solar and Stellar Flares: Are Extreme Events Scale-Free ?
Markus J. Aschwanden
We search for outliers in extreme events of statistical size distributions of astrophysical data sets, motivated by the {\sl Dragon-King hypothesis} of Sornette (2009), which sugge…
Global Energetics of Solar Flares: VIII. The Low-Energy Cutoff
Markus Aschwanden, Eduard P. Kontar, Natasha L. S. Jeffrey
One of the key problems in solar flare physics is the determination of the low-energy cut-off; the value that determines the energy of nonthermal electrons and hence flare energeti…
Global Energetics of Solar Flares: VII. Aerodynamic Drag in Coronal Mass Ejections
Markus J. Aschwanden, Nat Gopalswamy
The free energy that is dissipated in a magnetic reconnection process of a solar flare, generally accompanied by a coronal mass ejection (CME), has been considered as the ultimate…
Helical Twisting Number and Braiding Linkage Number of Solar Coronal Loops
Markus J. Aschwanden
Coronal loops in active regions are often characterized by quasi-circular and helically twisted (sigmoidal) geometries, which are consistent with dipolar potential field models in…