SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158

被引：15

作者：

Sorriso-Valvo, L. ^{[1
,2
]}

De Vita, G. ^{[1
,3
]}

Kazachenko, M. D. ^{[2
]}

Krucker, S. ^{[2
,4
]}

Primavera, L. ^{[3
]}

Servidio, S. ^{[3
]}

Vecchio, A. ^{[5
]}

Welsch, B. T. ^{[2
]}

Fisher, G. H. ^{[2
]}

Lepreti, F. ^{[3
]}

Carbone, V. ^{[3
]}

机构：

[1] CNR, IMIP, UOS LICRYL Cosenza, I-87036 Arcavacata Di Rende, Italy

[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[3] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, Italy

[4] Univ Appl Sci & Arts Northwestern Switzerland, Sch Engn, Inst Technol 4D, CH-5210 Windisch, Switzerland

[5] INGV, Sede Cosenza, I-87036 Arcavacata Di Rende, Italy

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 801卷 / 01期

基金：

美国国家科学基金会;

关键词：

Sun: flares; Sun: magnetic fields; turbulence; CORONAL MASS EJECTIONS; MAGNETIC-FIELD; CURRENT HELICITY; MAGNETOHYDRODYNAMIC TURBULENCE; ENERGY-SPECTRA; CANCELLATION; DYNAMICS; INTERMITTENCY; RECONNECTION; EVOLUTION;

D O I：

10.1088/0004-637X/801/1/36

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：13

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