Relaxation of Sheared Magnetic fields — a Process of Contraction.

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Presentation transcript:

Relaxation of Sheared Magnetic fields — a Process of Contraction

Events List The M1.2 flare of (Sui and Holman 2003) The M2.1 flare of (Ji, Wang, and Goode et al. 2004) The X3.1 flare of (Li and Gan 2005) The X3.9 flare of (Veronig, Karlicky, and Vrsnak et al. 2006) The M1.2 flare of (Ji, Huang, and Wang et al. 2006) The M6.8 flare of (Ji, Huang, and Wang 2007) The X10 flare of (Zhou, Ji and Huang 2006) The M5.7 flare of (Zhou, Ji and Huang 2006) The M1.0 flare of (Ji & Wang 2007)

2002/04/15  in the early phase of the flares, the looptop sources moves down  Velocity ~ tens of kilometers per second keV The M1.2 flare of : Motion of looptop sources

The M2.1 flare of : Motion of looptop sources and flare kernels

The X3.1 flare of : shrinkage of flaring loops

The M3.9 flare of : Motion of looptop sources

Flare shear

The M1.2 flare of : Motion of looptop sources and flare kernels – Unshear motion 03:18:44 – 03:18:56 03:19:08 – 03:19:20

The M1.2 flare of : Motion of looptop sources and flare kernels – Unshear motion

The M6.8 flare of : Motion of looptop sources, EUV flaring loops and flare kernels – Unshear motion

The M6.8 flare of : Motion of looptop sources, EUV flaring loops and flare kernels – Unshear motion

The M6.8 flare of : Motion of looptop sources, EUV flaring loops and flare kernels – Unshear motion

The flare of – unshear motion

The flare of

The flare of

Expansion of flaring loops ☆ inward motion of conjugate flaring kernels ☆ shrinkage of flaring loops (radio, EUV) ☆ descending of HXR looptop sources Unshear motion during contraction and expansion! Contraction of flaring loops ☆ outward motion of conjugate flaring kernels ☆ expansion of flaring loops (radio, EUV) ☆ upward motion of HXR looptop sources

Interpretation of Loop Contraction keV 1. Current sheet formation (Sui & Holman 2003, Sui et al. 2004) 2. Magnetic shrinkage (Acton & Forbes1996, Lin 2004) 3. Collapsing magnetic trap (Veronig et al. 2005) 4. Magnetic Implosion (Hudson 2000) reduced

Mapping effect from the Photosphere Modifying effect caused by Our interpretation (ApJ, 2007)

Unshear rate and HXR spikes The M1.0 flare of

What I am doing ★ A statistical study using old BBSO H-alpha data to study the contracting motion ★ A statistical study using HXR data to study the contracting motion ★ Analyzing the change of flare shear, and its relationship with magnetic shear using more events. ★ The correlation between the unshear rate with HXR spikes. ★ Verifying the analytical model from existing flare data. ★ ….

We can estimate the energy releasing rate of a flare Proportional to the GOES magnitude e.g. estimated by the contraction motion an integral over flaring region

The M1.1 flareThe M6.7 flare

What is the physical meaning of flare shear? e.g.

THANKS!