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SOHO/SUMER Observations of Prominence Oscillation before Eruption

SOHO/SUMER Observations of Prominence Oscillation before Eruption. P. F. Chen. Department of Astronomy Nanjing University Nanjing 210093 China chenpf@nju.edu.cn chenpf@njit.edu. In collaboration with D. Innes & S. Solanki. Researches on CMEs. Chen 2007, J. Astrophys. & Astron.

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SOHO/SUMER Observations of Prominence Oscillation before Eruption

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  1. SOHO/SUMER Observations of Prominence Oscillation before Eruption P. F. Chen Department of Astronomy Nanjing University Nanjing 210093 China chenpf@nju.edu.cn chenpf@njit.edu In collaboration with D. Innes & S. Solanki

  2. Researches on CMEs Chen 2007, J. Astrophys. & Astron. • Pre-CME structures • Initiation • Propagation • + associated Phenomena • Geo-effectiveness • Forecast How are CMEs triggered? How can CMEs be predicted? Precursors

  3. Precursors of CMEs Chen, Innes, & Solanki 2008, A&A • Emerging Flux (Feynman & Martin 1995) (2) SXR brightenings (Harrison 1989) (3) Radio Noise Storms (4) Type IIIRadio Burst (5)Filament Darkening & Widening Chen & Shibata, 2000, ApJ., 545, 524 (6) Anymore?

  4. HObservation from BBSO 2000 Sep 26 flare/CME event

  5. SUMER Spectral Observations

  6. Ocillating Motions Amplitude: ~15 km/s Period: ~20 min

  7. Eruption Lasco EIT 195

  8. Synthesis of the event Siphon flow  pressure difference along a loop Surge  reconnection btw emerging flux & corona Prominence eruption & flare  CSHKP model

  9. Theoretical Explanation

  10. Chen, Innes, & Solanki, 2008, A&A Filament Oscillation—another precursor for CMEs? Universality? Tether-cutting model (Moore &LaBonte 1980) Ambiguity? 12 times the oscillation period in our case

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