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New Year’s Comet

New Year’s Comet. Evolution of Magnetic Fields in Convection Zone. Study of the evolution of magnetic fields in the convection zone over cycle 23 from SOHO/MDI oscillation measurements Poloidal field + double-peaked near-surface toroidal field Poloidal : 124 ± 16 G

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New Year’s Comet

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  1. New Year’s Comet

  2. Evolution of Magnetic Fields in Convection Zone • Study of the evolution of magnetic fields in the convection zone over cycle 23 from SOHO/MDI oscillation measurements • Poloidal field + double-peaked near-surface toroidal field • Poloidal: 124 ± 16 G • Toroidal: 380 ± 30 @ 0.999 R 1.4 ±0.2 kG @ 0.996 R • Field strengths highly correlated with surface activity Baldner et al.: 2009, ApJ 705, 1704

  3. Quasi-periodic Oscillations in LASCO CME Speeds • Analysis of the speed-distance profiles of a sample of 116 CMEs • 15 cases show quasi-periodic oscillations with periods from 48 to 240 min • Oscillations interpreted as normal modes of 3D flux ropes Shanmugaraji et al.: 2010, ApJ 708, 450

  4. The Nascent Fast Solar Wind Observed in the Corona by Hinode/EIS Temperature / MK 0.63 1 1.3 1.8 • Origin of fast solar wind one of the most important unresolved problems in space and solar physics • Deep exposures in corona hole with EIS reveals first spectroscopic signatures of nascent fast solar wind at coronal temperatures (T > 1 MK) • Outflows become stronger with increasing temperature • Isolated outflow patches in transition region merge in corona, in agreement with scenario of solar wind outflow being guided by expanding magnetic funnels Doppler Shift (outflow) Intensity Tian et al.: 2010, ApJ 709, L88

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