Sunspot Contrast Measurements from MDI Full-Disk Images: Variations with Disk Position and Solar Cycle Phase

Details Sunspot Contrast Measurements from MDI Full-Disk Images: Variations with Disk Position and Solar Cycle Phase Sunspot Contrast Measurements from MDI Full-Disk Images: Variations with Disk Position and Solar Cycle Phase

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0374l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0374

Physics

1650 Solar Variability (7537), 7524 Magnetic Fields, 7529 Photosphere, 7538 Solar Irradiance

Scientific paper

We report measurements of sunspot umbral and penumbral contrast as a function of Magnetic Flux Density (MFD), disk position, and time over Solar Cycle 23 from full-disk magnetogram and continuum images of the SOHO/MDI instrument. Using a technique of image segmentation which utilizes region labeling of entire MDI intensity images in order to segment prospective sunspots and then the application of radial derivatives from the centers of the spots we successfully identify the umbral-penumbral interface of large sunspots in the MDI database. The extracted penumbral and umbral pixels of these images are binned according to MFD and disk position to study the behavior of sunspot contrast. We report measurements of sunspot umbral and penumbral contrast as a function of Magnetic Flux Density (MFD), disk position, and time over Solar Cycle 23 from full- disk magnetogram and continuum images of the SOHO/MDI instrument. This research was partially supported by LWS TR&T Grant NNG05 GK48G.

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