SOHO/SUMER Observations of Prominence Oscillation before Eruption Department of Astronomy Nanjing University Nanjing 210093 China

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Presentation transcript:

SOHO/SUMER Observations of Prominence Oscillation before Eruption Department of Astronomy Nanjing University Nanjing 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 Precursors How 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