SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158

ABSTRACT Solar Active Region NOAA 11158 has hosted a number of strong flares, including one X2.2 event. The complexity of current density and current helicity are studied through cancellation analysis of their sign-singular measure, which features power-law scaling. Spectral analysis is also perform...

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Bibliographic Details
Published in:The Astrophysical journal 2015-03, Vol.801 (1), p.36
Main Authors: Sorriso-Valvo, L., De Vita, G., Kazachenko, M. D., Krucker, S., Primavera, L., Servidio, S., Vecchio, A., Welsch, B. T., Fisher, G. H., Lepreti, F., Carbone, V.
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CORRELATIONS
CURRENT DENSITY
ERUPTION
HELICITY
INDEXES
MAGNETIC FIELDS
SINGULARITY
SOLAR FLARES
STAR EVOLUTION
SUN
Sun: flares
Sun: magnetic fields
TURBULENCE
X RADIATION
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Summary:ABSTRACT Solar Active Region NOAA 11158 has hosted a number of strong flares, including one X2.2 event. The complexity of current density and current helicity are studied through cancellation analysis of their sign-singular measure, which features power-law scaling. Spectral analysis is also performed, revealing the presence of two separate scaling ranges with different spectral index. The time evolution of parameters is discussed. Sudden changes of the cancellation exponents at the time of large flares and the presence of correlation with Extreme-Ultra-Violet and X-ray flux suggest that eruption of large flares can be linked to the small-scale properties of the current structures.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.1088/0004-637X/801/1/36