Download presentation
Presentation is loading. Please wait.
2
SOHO/SUMER Observations of Prominence Oscillation before Eruption Department of Astronomy Nanjing University Nanjing 210093 China chenpf@nju.edu.cn chenpf@njit.edu P. F. Chen In collaboration with D. Innes & S. Solanki
3
Researches on CMEs 1.Pre-CME structures 2.Initiation 3.Propagation + associated Phenomena 4.Geo-effectiveness 5.Forecast Precursors How are CMEs triggered? How can CMEs be predicted? Chen 2007, J. Astrophys. & Astron.
4
Precursors of CMEs (1) Emerging Flux (Feynman & Martin 1995) Chen, Innes, & Solanki 2008, A&A Chen & Shibata, 2000, ApJ., 545, 524 (2) SXR brightenings (Harrison 1989) (3) Radio Noise Storms (4) Type III Radio Burst (5) Filament Darkening & Widening (6) Anymore?
5
H Observation from BBSO 2000 Sep 26 flare/CME event
7
SUMER Spectral Observations
8
Ocillating Motions Amplitude: ~15 km/s Period: ~20 min
9
Eruption EIT 195 Lasco
10
Synthesis of the event Surge reconnection btw emerging flux & corona Siphon flow pressure difference along a loop Prominence eruption & flare CSHKP model
11
Theoretical Explanation
12
Filament Oscillation — another precursor for CMEs? Ambiguity? Tether-cutting model (Moore &LaBonte 1980) Universality? 12 times the oscillation period in our case Chen, Innes, & Solanki, 2008, A&A
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.