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Title: 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 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.

Authors:
;  [1]; ; ; ;  [2]; ; ; ;  [3];  [4]
  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)
  4. INGV, Sede di Cosenza, Ponte P. Bucci, Cubo 30C, I-87036 Rende (Italy)
Publication Date:
OSTI Identifier:
22522049
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 801; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATIONS; CURRENT DENSITY; ERUPTION; HELICITY; INDEXES; MAGNETIC FIELDS; SINGULARITY; SOLAR FLARES; STAR EVOLUTION; SUN; TURBULENCE; X RADIATION

Citation Formats

Sorriso-Valvo, L., De Vita, G., Kazachenko, M. D., Krucker, S., Welsch, B. T., Fisher, G. H., Primavera, L., Servidio, S., Lepreti, F., Carbone, V., and Vecchio, A., E-mail: sorriso@fis.unical.it. SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158. United States: N. p., 2015. Web. doi:10.1088/0004-637X/801/1/36.
Sorriso-Valvo, L., De Vita, G., Kazachenko, M. D., Krucker, S., Welsch, B. T., Fisher, G. H., Primavera, L., Servidio, S., Lepreti, F., Carbone, V., & Vecchio, A., E-mail: sorriso@fis.unical.it. SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158. United States. doi:10.1088/0004-637X/801/1/36.
Sorriso-Valvo, L., De Vita, G., Kazachenko, M. D., Krucker, S., Welsch, B. T., Fisher, G. H., Primavera, L., Servidio, S., Lepreti, F., Carbone, V., and Vecchio, A., E-mail: sorriso@fis.unical.it. Sun . "SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158". United States. doi:10.1088/0004-637X/801/1/36.
@article{osti_22522049,
title = {SIGN SINGULARITY AND FLARES IN SOLAR ACTIVE REGION NOAA 11158},
author = {Sorriso-Valvo, L. and De Vita, G. and Kazachenko, M. D. and Krucker, S. and Welsch, B. T. and Fisher, G. H. and Primavera, L. and Servidio, S. and Lepreti, F. and Carbone, V. and Vecchio, A., E-mail: sorriso@fis.unical.it},
abstractNote = {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.},
doi = {10.1088/0004-637X/801/1/36},
journal = {Astrophysical Journal},
number = 1,
volume = 801,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}