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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. 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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slide1

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)
slide3

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

slide4

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

Motion of looptop sources and flare kernels

slide8

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

slide9

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

Motion of looptop sources and flare kernels – Unshear motion

slide10

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

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion

slide11

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

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion

slide12

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

Motion of looptop sources, EUV flaring loops and flare kernels

– Unshear motion

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

slide21

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.

★ ….

slide26

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

slide28

The M1.1 flare

The M6.7 flare

slide29

e.g.

What is the physical meaning of flare shear?

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