Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9216h&link_type=abstract
American Astronomical Society Meeting 210, #92.16; Bulletin of the American Astronomical Society, Vol. 39, p.211
Astronomy and Astrophysics
Astronomy
Scientific paper
Synoptic maps provide a global view of the solar magnetic field. However, what constitutes the 'best' possible synoptic map depends on the application. Traditional charts are compiled from data observed close to central meridian from magnetograms observed over a 27-day solar rotation. But with higher resolution data, a whole new set of details must be addressed when assembling such maps. Small-scale features move and evolve on the time scale over which the maps are constructed. The fluctuating background noise level is comparable to the smallest features. Projection effects and sensitivity variations of different sorts complicate the effort. And what about the polar field? (See accompanying poster by Liu et al.) Parts of the Sun cannot be seen. We describe methods for assembling the best maps possible by accounting for image sensitivity, image scale, corrupt pixels, differential rotation, geometric field projection, zero offset, varying noise characteristics of MDI magnetograms, and polar field interpolation.
Amezcua A.
Hoeksema Jon Todd
Liu Ya-Ying
Zhao Xiaopeng
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