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Solar disk and the global solar magnetic field on 2005 January 17. (a) Full-disk solar magnetogram from SOHO/MDI, as obtained by Solar Monitor (Gallagher et al., 2007). The source NOAA AR 10720 is visible in the north-western quadrant. (b) The global PFSS-extrapolated solar magnetic field early on 2005 January 17. Closed field lines are white while positive- and negative-polarity “open” field lines are colored magenta and green, respectively.
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