Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...469l.135g&link_type=abstract
Astrophysical Journal Letters v.469, p.L135
Astronomy and Astrophysics
Astronomy
36
Sun: Activity, Sun: Corona, Sun: Flares, Sun: Magnetic Fields, Stars: Activity, Stars: Flare
Scientific paper
It has been proposed that flares in the solar corona may well be a result of an internal self-organized critical (SOC) process in active regions. We have developed a cellular automaton SOC model that simulates flaring activity extending over an active sub-flaring background. In the resulting frequency distributions we obtain two distinct power laws. That of the weaker events is shorter and much steeper (power law with index ~=-3.26) than that of the intermediate and large events (power law with index ~=-1.73). The flatter power law is in close agreement with observations of flares. Weaker events are responsible for ~=90% of the total magnetic energy released, indicating a possible connection of nanoflares with coronal heating. Moreover, certain mechanisms cause the variability of the resulting indices and may provide answers to the problem of the variability of flares' occurrence frequency during the solar cycle.
Georgoulis Manolis K.
Vlahos Loukas
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