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

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Presentation transcript:

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

October 27, 2005Center for Solar-Terrestrial Research 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

October 27, 2005Center for Solar-Terrestrial Research Granulation – G–Band & Ca II K

October 27, 2005Center for Solar-Terrestrial Research Dynamics of Quiet Sun Magnetic Fields CaII K H  – 0.06 nm CaI nm Magnetogram

October 27, 2005Center for Solar-Terrestrial Research 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)

October 27, 2005Center for Solar-Terrestrial Research Size and Lifetime Brandt et al. (1991)

October 27, 2005Center for Solar-Terrestrial Research Nesis et al. (2001)

October 27, 2005Center for Solar-Terrestrial Research Power Spectrum Deubner & Mattig (1975)

October 27, 2005Center for Solar-Terrestrial Research Velocity Distribution Functions Durrant et al. (1979)