Spatio-Temporal Dynamics of Magnetic Fields and Flaring Productivity of Active Regions
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Spatio-Temporal Dynamics ofMagnetic Fields
and Flaring Productivity of Active Regions
Valentina I. AbramenkoBig Bear Solar Observatory of NJIT
Email: [email protected]://www.bbso.njit.edu/~avi/
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Introduction
The 2005 Joint Assembly / AGU,SEG, NABS and SPD/AAS, May 23-27, 2005, New Orleans, LA, USA
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Introduction
Essential properties of the photospheric plasma:
Magnetized plasma in a turbulent state (Parker 1979),very intermittent (or, in other words, multifractal) medium (Lawrence et al. 1993, Abramenko et al. 2002),
where the magnetic helicity may have an inverse cascade (Biskamp 1993)
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IntroductionSituation in the photosphere – flaring in the corona:
Magnetic helicity transport in the photosphere (Rust & LaBonte 2003; Georgoulis – present meeting; Chae2001; Romano 2005 ).
Statistical properties of electric currents, current helecity, magnetic flux, etc., derived from vector-magnetograms (Leka & Barnes 2004).
Fractal dimensions of the photospheric magnetic fields (Tarbell et al. 1990; Balke et al. 1993; Meunier 1999;
McAteer, Gallagher & Ireland 2005).
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IntroductionSituation in the photosphere – flaring in the corona:
we propose to analyze
1. Distribution functions of the magnetic flux in elements of the magnetic field in active regions
(Abramenko & Longcope, ApJ, 2005)
2. Multifractality (intermittency) of the photospheric magnetic fields – poster SP41B-04 (Abramenko, Yurchyshyn, Wang, Goode, ApJ 577, 2002).
3. Turbulence state of the photospheric magnetic field as derived from magnetic power spectrum – present talk.
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Observational Data:SoHO/MDI high resolution magnetograms
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Soft X-ray Flare Index
For example, during 13 days an active region launched flares:
X5.2 , M1.2 , C6.0
A=(520 + 12 + 6.0) / 13 = 41.4 (in units 10 W m )-6 -2
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Magnetic Power SpectrumFlare-quiet active region 0061 (A=2.6) Flaring active region 9077 (A=120)
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Magnetic Power Spectrum:time-variations of the power index
Flare-quiet active region 0061:
Flaring active region 9077:
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Magnetic Power Spectrum:emerging active region
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Soft X-ray Flare Indexversus Magnetic power index
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Magnetic Power Spectrum:calculations
kx
yk
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Table 2: Emerging Active Regions
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Table 1: Active Regions
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Emerging of a Flare-quiet Active Region NOAA 9851
http://www.bbso.njit.edu/~avi/PowerSp.pdf
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Emergence of a Flaring Active Region NOAA 0365
http://www.bbso.njit.edu/~avi/PowerSp.pdf