Fig. B.5.
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Axial (m = 0) mode decomposition of the WSO and SOHO/MDI & SDO/HMI magnetograms, for spherical harmonics up to l = 15. The top row shows the result from WSO (1976-2022) and second row from SOHO/MDI & SDO/HMI (1996-present). Field strengths from WSO are multiplied by a factor of 3.5, to be comparable with SOHO/MDI & SDO/HMI. The bottom row displays the monthly sunspot number during this time, taken from WDC-SILSO.
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