SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158

Journal Article · Sun Mar 01 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/801/1/36· OSTI ID:22522049

Sorriso-Valvo, L.; De Vita, G. ^[1]; Kazachenko, M. D.; Krucker, S.; Welsch, B. T.; Fisher, G. H. ^[2]; Primavera, L.; Servidio, S.; Lepreti, F.; Carbone, V. ^[3]

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1. IMIP-CNR, U.O.S. LICRYL di Cosenza, Ponte P. Bucci, Cubo 31C, I-87036 Rende (Italy)
2. Space Sciences Laboratory, University of California, 7 Gauss Way, Berkeley 94720, California (United States)
3. Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, I-87036 Rende (Italy)

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.

• OSTI ID: 22522049
• Journal Information: Astrophysical Journal, Vol. 801, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CORRELATIONS
CURRENT DENSITY
ERUPTION
HELICITY
INDEXES
MAGNETIC FIELDS
SINGULARITY
SOLAR FLARES
STAR EVOLUTION
SUN
TURBULENCE
X RADIATION