Relaxation of Sheared Magnetic fields
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Relaxation of Sheared Magnetic fields — a Process of Contraction. Events List. The M1.2 flare of 2002-04-15 (Sui and Holman 2003) The M2.1 flare of 2002-09-09 (Ji, Wang, and Goode et al. 2004) The X3.1 flare of 2002-08-24 (Li and Gan 2005)

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Relaxation of Sheared Magnetic fields — a Process of Contraction

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Relaxation of sheared magnetic fields a process of contraction

Relaxation of Sheared Magnetic fields

— a Process of Contraction


Events list

Events List

  • The M1.2 flare of 2002-04-15 (Sui and Holman 2003)

  • The M2.1 flare of 2002-09-09 (Ji, Wang, and Goode et al. 2004)

  • The X3.1 flare of 2002-08-24 (Li and Gan 2005)

  • The X3.9 flare of 2003-11-03 (Veronig, Karlicky, and Vrsnak et al. 2006)

  • The M1.2 flare of 2004-11-01 (Ji, Huang, and Wang et al. 2006)

  • The M6.8 flare of 2003-06-13 (Ji, Huang, and Wang 2007)

  • The X10 flare of 2003-10-29 (Zhou, Ji and Huang 2006)

  • The M5.7 flare of 2002-03-14 (Zhou, Ji and Huang 2006)

  • The M1.0 flare of 2002-07-26 (Ji & Wang 2007)


Relaxation of sheared magnetic fields a process of contraction

The M1.2 flare of 2002-04-15: Motion of looptop sources

10-25 keV

  • in the early phase of the flares, the looptop sources moves down

  • Velocity ~ tens of kilometers per second

2002/04/15


Relaxation of sheared magnetic fields a process of contraction

The M2.1 flare of 2002-09-09:

Motion of looptop sources and flare kernels


Relaxation of sheared magnetic fields a process of contraction

The X3.1 flare of 2002-08-24: shrinkage of flaring loops


Relaxation of sheared magnetic fields a process of contraction

The M3.9 flare of 2003-11-03: Motion of looptop sources


Flare shear

Flare shear


Relaxation of sheared magnetic fields a process of contraction

The M1.2 flare of 2004-11-01:

Motion of looptop sources and flare kernels – Unshear motion

03:19:08 – 03:19:20

03:18:44 – 03:18:56


Relaxation of sheared magnetic fields a process of contraction

The M1.2 flare of 2004-11-01:

Motion of looptop sources and flare kernels – Unshear motion


Relaxation of sheared magnetic fields a process of contraction

The M6.8 flare of 2003-06-17:

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion


Relaxation of sheared magnetic fields a process of contraction

The M6.8 flare of 2003-06-17:

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion


Relaxation of sheared magnetic fields a process of contraction

The M6.8 flare of 2003-06-17:

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion


Relaxation of sheared magnetic fields a process of contraction

The flare of 2002-03-14 – unshear motion


Relaxation of sheared magnetic fields a process of contraction

The flare of 2002-03-14 – unshear motion


Relaxation of sheared magnetic fields a process of contraction

The flare of 2002-03-14


Relaxation of sheared magnetic fields a process of contraction

The flare of 2003-10-29


Relaxation of sheared magnetic fields a process of contraction

The flare of 2003-10-29


Expansion of flaring loops

Expansion of flaring loops

  • ☆ outward motion of conjugate flaring kernels

  • ☆ expansion of flaring loops (radio, EUV)

  • ☆ upward motion of HXR looptop sources

  • Contraction 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!


    Interpretation of loop contraction

    Interpretation of Loop Contraction

    10-25 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


    Relaxation of sheared magnetic fields a process of contraction

    Our interpretation (ApJ, 2007)

    Modifying effect caused by

    Mapping effect

    from

    the Photosphere


    Unshear rate and hxr spikes

    Unshear rate and HXR spikes

    The M1.0 flare of

    2002-07-26


    What i am doing

    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.

    ★ ….


    Relaxation of sheared magnetic fields a process of contraction

    e.g.

    We can estimate the energy releasing rate of a flare

    an integral over flaring region

    estimated by the contraction motion

    Proportional to the GOES magnitude


    Relaxation of sheared magnetic fields a process of contraction

    The M1.1 flare

    The M6.7 flare


    Relaxation of sheared magnetic fields a process of contraction

    e.g.

    What is the physical meaning of flare shear?


    Relaxation of sheared magnetic fields a process of contraction

    THANKS!


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