soho/sumer observations of prominence oscillation before eruption department of astronomy nanjing...
Post on 15-Jan-2016
219 views
TRANSCRIPT
SOHO/SUMER Observations of Prominence Oscillation before Eruption
Department of Astronomy
Nanjing University
Nanjing 210093
China
P. F. Chen
In collaboration with
D. Innes & S. Solanki
Researches on CMEs
1. Pre-CME structures
2. Initiation
3. Propagation
+ associated Phenomena
4. Geo-effectiveness
5. Forecast
PrecursorsHow are CMEs triggered?
How can CMEs be predicted?
Chen 2007, J. Astrophys. & Astron.
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?
H Observation from BBSO
2000 Sep 26 flare/CME event
SUMER Spectral Observations
Ocillating Motions
Amplitude: ~15 km/s
Period: ~20 min
Eruption
EIT 195 Lasco
Synthesis of the event
Surge reconnection btw emerging flux & corona
Siphon flow pressure difference along a loop
Prominence eruption & flare CSHKP model
Theoretical Explanation
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