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Solar disk and the global solar magnetic field on 2005 September 13. (a) Full-disk solar magnetogram from SOHO/MDI, as obtained by Solar Monitor. The source NOAA AR 10808 is visible in the southern hemisphere, close to the central meridian. (b) The global PFSS-extrapolated solar magnetic field at about the same time. Closed field lines are white while positive- and negativepolarity “open” field lines are colored magenta and green, respectively.
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