Continuum Contrast as a function of Magnetic Flux Density and Disk Position: Results from a full Solar Cycle of SOHO/MDI data

Details Continuum Contrast as a function of Magnetic Flux Density and Disk Position: Results from a full Solar Cycle of SOHO/MDI data Continuum Contrast as a function of Magnetic Flux Density and Disk Position: Results from a full Solar Cycle of SOHO/MDI data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0373s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0373

Physics

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

Scientific paper

The key to understanding total solar irradiance variability is to understand the mechanisms by continuum contrast is effected by the distribution of magnetic flux across the surface of the Sun. The Michelson Doppler Imager (MDI) instrument on the Solar and Heliospheric Observatory (SOHO) satellite has measured full-disk Stokes-V magnetograms along with cotemporal continuum images throughout Solar Cycle 23. We present the results of an examination of the relationship between corrected MDI continuum images with their cotemporal corrected MDI magnetograms. By separating the series of images into bins of Magnetic Flux Density (MFD) and limb angle, we perform a non-linear least squares fit to the data to produce a 3rd-order polynomial function of continuum contrast vs. MFD and disk position. Using the obtained function we can accurately predict continuum contrast at any given disk position as a function of MFD measured in a given magnetogram. The resulting predictions can be used to make simulated continuum images suitable for bolometric correction and input into total irradiance models. This research was partially supported by LWS TR&T Grant NNG05GK46G

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