130 likes | 217 Views
Line Profile Characteristics of Solar Explosive Event Bursts. Z. Ning et al 2004 A&A 419,1141. Speaker: Jinping Dun. 1. Introduction. Explosive Event is a small-scale, short-lifetime phenomenon in the transition region of quiet Sun. Main Characteristics Broaden Line Profile
E N D
Line Profile Characteristics of Solar Explosive Event Bursts Z. Ning et al 2004 A&A 419,1141 Speaker: Jinping Dun
1. Introduction • Explosive Eventis 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) • MDI Magnetogram The area rastered by SUMER and locations of explosive events
2. Observations and Data Reduction (ii) • SiIV 1393 Å Spectrum Slit ~ 1” x120” Step ~ 6 Interval~ 1.13” Exposure Time ~5s
3.Examples and Results (i) • Time Variation of Integrated Intensity
3.Examples and Results (ii) • Repetition of Explosive Events
3.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.Examples and Results (iv) • The Magnetic Field Emergence (white) and Cancellation (black)
4.Discussion • 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.
Profile of Explosive Event (i) Velocity Along Line-of-sight V=0 Explosive Event V<0(blue-Shift) V>0(red-shift) Wavelength
Profile of Explosive Event (ii) SiIV 1393.78 Ni 1393.33
Profile of Explosive Event (iii) stationary component red-shift components blue-shift component three components: stationary and two high-speed (along line-of-sight) sources. (Chae et al.1998,ApJ,497,L109)