New Year’s Comet

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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 - PowerPoint PPT Presentation

Text of New Year’s Comet

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New Years Comet

Evolution of Magnetic Fields in Convection ZoneStudy of the evolution of magnetic fields in the convection zone over cycle 23 from SOHO/MDI oscillation measurementsPoloidal field + double-peaked near-surface toroidal fieldPoloidal: 124 16 GToroidal: 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

Quasi-periodic Oscillations in LASCO CME SpeedsAnalysis of the speed-distance profiles of a sample of 116 CMEs15 cases show quasi-periodic oscillations with periods from 48 to 240 minOscillations interpreted as normal modes of 3D flux ropesShanmugaraji et al.: 2010, ApJ 708, 450

The Nascent Fast Solar Wind Observed in the Corona by Hinode/EISOrigin of fast solar wind one of the most important unresolved problems in space and solar physicsDeep 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 temperatureIsolated outflow patches in transition region merge in corona, in agreement with scenario of solar wind outflow being guided by expanding magnetic funnels

Tian et al.: 2010, ApJ 709, L88

Temperature / MK0.63 1 1.3 1.8Doppler Shift (outflow) Intensity