PMO OpenIR  > 太阳活动的多波段观测研究团组
DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION
Shen, Jinhua1,2,3; Ji, Haisheng1; Wiegelmann, Thomas2; Inhester, Bernd2; Shen, JH (reprint author), Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China. Email: 0
2013-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume764Issue:1Pages:86-86
AbstractIn this paper, we study the magnetic energy (ME) structure contained in the solar corona over the active region NOAA 11158. The time period is chosen as from 0: 00 to 06: 00 UT on 2011 February 15, during which an X-class flare occurred. The nonlinear force-free field (NLFFF) and the potential field extrapolation are carried out to model the coronal magnetic field over this active region, using high-quality photospheric vector magnetograms observed by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory as boundary conditions. We find that the volume distribution for the density of the ME (B-2/8 pi) and the ohmic dissipation power (ODP, j(2)/sigma), in which j is the electric current density (c/4 pi del x B) and sigma is the conductivity in the corona, can be readily fitted by a broken-down double-power law. The turn-over density for the spectrum of the ME and ODP is found to be fixed at similar to 1.0 x 10(4) erg cm(-3) and similar to 2.0 x 10(-15) W cm(-3) (assuming sigma = 10(5) Omega(-1) m(-1)), respectively. Compared with their first power-law spectra (fitted below the corresponding turn-over value) which remain unchanged, the second power-law spectra (fitted above the corresponding turn-over value) for the NLFFF's ME and ODP show flare-associated changes. The potential field remains steady. These results indicate that a magnetic field with energy density larger than the turn-over energy density plays a dominant role in powering the flare.
KeywordSun: Corona Sun: Flares Sun: Magnetic Topology
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/764/1/86
WOS KeywordX-CLASS FLARES ; ELECTRIC-CURRENTS ; VECTOR MAGNETOGRAMS ; FIELDS ; EVOLUTION ; AMBIGUITY ; RECONSTRUCTION ; MORPHOLOGY ; OCTOBER ; SHEAR
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000314335200086
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9950
Collection太阳活动的多波段观测研究团组
Corresponding AuthorShen, JH (reprint author), Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China. Email: 0
Affiliation1.Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany
3.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Shen, Jinhua,Ji, Haisheng,Wiegelmann, Thomas,et al. DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION[J]. ASTROPHYSICAL JOURNAL,2013,764(1):86-86.
APA Shen, Jinhua,Ji, Haisheng,Wiegelmann, Thomas,Inhester, Bernd,&Shen, JH .(2013).DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION.ASTROPHYSICAL JOURNAL,764(1),86-86.
MLA Shen, Jinhua,et al."DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION".ASTROPHYSICAL JOURNAL 764.1(2013):86-86.
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