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Physics 681: Solar Physics and Instrumentation – Lecture 16

Physics 681: Solar Physics and Instrumentation – Lecture 16. Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research. Granulation. Cellular pattern covering the entire Sun Granules (bright isolated elements) and intergranular lanes (dark background)

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Physics 681: Solar Physics and Instrumentation – Lecture 16

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  1. Physics 681: Solar Physics and Instrumentation – Lecture 16 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research

  2. Granulation • Cellular pattern covering the entire Sun • Granules (bright isolated elements) and intergranular lanes (dark background) • Bright granules: upward-moving (blue-shift), hot parcels of gas • Intergranular lanes: downward-moving (red-shift), cooler material • Intensity contrast (Planck spectrum) • Contrast in excess of 10% • Seeing attenuated high-frequency part of the power spectrum  diminishing the contrast of small-scale features • Solar eclipse are used to measure the telescope MTF • Image restoration • Power spectrum analysis Center for Solar-Terrestrial Research

  3. Granulation – G–Band & Ca II K Center for Solar-Terrestrial Research

  4. Ha – 0.06 nm CaII K Magnetogram CaI 610.3 nm Dynamics of Quiet Sun Magnetic Fields Center for Solar-Terrestrial Research

  5. Model of Convection 3D animation of convection. The animation shows temperature fluctuations in a layer of unstable, turbulent gas. (Courtesy of Andrea Malagoli, University of Chicago) Center for Solar-Terrestrial Research

  6. Size and Lifetime Brandt et al. (1991) Center for Solar-Terrestrial Research

  7. Nesis et al. (2001) Center for Solar-Terrestrial Research

  8. Power Spectrum Deubner & Mattig (1975) Center for Solar-Terrestrial Research

  9. Velocity Distribution Functions Durrant et al. (1979) Center for Solar-Terrestrial Research

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