Line Profile Characteristics of Line Profile Characteristics of Solar Explosive Event BurstsSolar Explosive Event Bursts

Z. Ning et al 2004 A&A 419,1141

Speaker: Jinping Dun

1. Introduction1. Introduction

Explosive Event is a small-scale, short-lifetime phenomenon in the transition region of quiet Sun.

Main Characteristics

Broaden Line Profile

T ~ 105K ( i.e. SiIV 1393 Å) V~100km/s

Size ~ 2” Lifetime ~ 1min

Physical Model

Plasma Jets Produced by Magnetic Reconnection

2. Observations and Data Reduction (i)2. Observations and Data Reduction (i)

MD

I Magnetogram

The area rastered by SUMER and locations of explosive events

2. Observations and Data Reduction (ii)2. Observations and Data Reduction (ii)

SiIV 1393 Å Spectrum Slit ~ 1” x120”

Step ~ 6

Interval~ 1.13”

Exposure Time ~5s

3.3. Examples and Results (i)Examples and Results (i)

Time Variation of Integrated Intensity

3.3. Examples and Results (ii)Examples and Results (ii) Repetition of Explosive Events

3.3. Examples and Results (iii)Examples and Results (iii)

2D Time Evolution of 5 Groups of Events

The black dashed line boxes surround events with obvious red-blue wing spatial offset.

(Evidence of reconnection jets, Innes et al.,1997, Nature,386,811)

3.3. Examples and Results (iv)Examples and Results (iv) The Magnetic Field

Emergence (white) and Cancellation (black)

4.4. DiscussionDiscussion

2D Structure Evolution of Explosive Events

Repetition of Explosive Events Magnetic reconnection could be triggered by

3~5 min oscillation waves in the chromospheric and transition region.

Thank YouThank You ！！

Profile of Explosive Event (i)Profile of Explosive Event (i)

Wavelength

Velocity Along Line-of-sight V=0

V>0(red-shift)V<0(blue-Shift)

Explosive Event

Profile of Explosive Event Profile of Explosive Event (ii)(ii)

Ni 1393.33Ni 1393.33

SiIV 1393.78SiIV 1393.78

three components: stationary and two high-speed (along line-of-sight) sources. (Chae et al.1998,ApJ,497,L109)

stationary component

blue-shift component red-shift components

Profile of Explosive Event (iii)Profile of Explosive Event (iii)