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Giant Convective Cell 観測と理論

Giant Convective Cell 観測と理論. 太陽雑誌会（２００５．３．６） 北井. 概要. はじめに 理論の紹介 GLOBAL-SCALE TURBULENT CONVECTION AND MAGNETIC DYNAMO ACTION IN THE SOLAR ENVELOPE A. S. Brun, M. S. Miesch, J. Toomre (Ap J, 614:1073–1098, 2004) 観測の紹介 PHOTOMETRIC SEARCH FOR SOLAR GIANT CONVECTION CELLS

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Giant Convective Cell 観測と理論

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  1. Giant Convective Cell 観測と理論 太陽雑誌会（２００５．３．６） 北井

  2. 概要 • はじめに • 理論の紹介 GLOBAL-SCALE TURBULENT CONVECTION AND MAGNETIC DYNAMOACTIONIN THE SOLAR ENVELOPE A. S. Brun, M. S. Miesch, J. Toomre (Ap J, 614:1073–1098, 2004) • 観測の紹介 PHOTOMETRIC SEARCH FOR SOLAR GIANT CONVECTION CELLS W.-H. Chiang, L.D. Petro, P.V. Foukal (Solar Phy. 110, p129,1987) THE DETECTION OF GIANT VELOCITY CELLS ON THE SUN J.G. Beck, T.L. Duvall, Jr, P.H.Sherrer, and J.H. Hoeksema( Soho6/GONG98 Workshop, 1998) 62-DAYS AROUND THE SUN: A SEARCH FOR SUPERGRANULAR EVOLUTION AND GIANT CELLS L.H. Strous and G.W. Simon ( ASP conf. series 140, 161, 1988) • SMARTデータによる観測計画案

  3. Giant Convetive Cell

  4. GLOBAL-SCALE TURBULENT CONVECTIONBrun’sNumerical Simulation • 3D spherical shell • Anelastic MHD Equation Neglection of Sound speed :infinite • Thermodynamic Quantities Sherical symmetiric component +fluctuation • D : Viscous tensor

  5. GLOBAL-SCALE TURBULENT CONVECTIONBrun’sNumerical Simulation • Boundary condition • Shell 0.72-0.98 Solar Radius

  6. GLOBAL-SCALE TURBULENT CONVECTIONBrun’sNumerical Simulation

  7. GLOBAL-SCALE TURBULENT CONVECTIONBrun’sNumerical Simulation

  8. GLOBAL-SCALE TURBULENT CONVECTIONBrun’sNumerical Simulation

  9. 観測（１）　Chiang et al • Kitt Peak • Search for large-scale temperature fluctuation • Photometry atλ525.6nm by 512-diode Reticon through spectrometer • Spatial scan perpendicular to the solar rotation axis • 15days, 4 N-zone + 4 S-zone scan

  10. 観測（１）　Chiang et al

  11. 観測（１）　Chiang et al • Temperature Fluctuation RMS = 0.33K ( 0.023%) Spatial scale 80-240Mm ⇒Detection of Giant Cell ? 　　　　　　（Simulation predicts ΔT≒１K)

  12. 観測(2)Beck et al • SOHO/MDI Doppler data Daily averaged frame / 1440 frames taken in 1-min cadence • Low resolution data (12deg square) May 1996-Sep 1997 : 505days time series • Medium resolution data ( 32min square ) May 1996-Nov 1997 : 576days time series

  13. 観測(2)Beck et al (Low Resolution) 27-days long-lived feature Lifetime : 4months V(horizontal) : 3.6m/s L(horizontal) : 44deg

  14. 観測(2)Beck et al (Medium Resolution) Velocity amplitude : 3.2m/s Cell : Horizontally elongated ( 56 deg x 7 deg ) ⇒Detection of Giant Cells

  15. 観測（３）Strous & Simon • 62-day time-series of full-disk SOHO/MDI Dopplergrams obtained at a one-minute cadence • Subtraction of background Doppler signal (5-degree polynomial fitting) • Spatial smoothing ( 85” and 171” ) • Movie Watch ⇒No giant cells detected

  16. 観測（３）Strous & Simon • Feature Tracking ( SG cells as tracers )

  17. 観測（３）Strous & Simon Result Unexplained horizontal velocity field of 30m/sec ⇒Detection of Giant cell inconclusive

  18. Hida-FMTでの解析

  19. Hida-FMTでの解析

  20. Hida-FMTでの解析

  21. Hida-FMTでの解析

  22. SMARTでの解析 • Full-disk Hα wing image • LCTM ( Even-Odd test, Reverse test ) • Tracer : Supergranulation • Spatial resolution : 0.5” ( FMT 4”) Merit : Tracers all over the disk Deficit : Interrupttion by nights

  23. END

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