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Comparisons of solar magnetic-field measurements made in different spectrallines are very important, especially in those lines in which observations havea long history or(and) specific diagnostic significance. The spectral lines FeI523.3 nm and FeI525.0 nm belong to this class. Therefore, this study is devotedto a comprehensive analysis using new high-precision Stokes-meter full-diskobservations. The disk-averaged magnetic-field strength ratio R =B(523.3)/B(525.0) equals 1.97 +- 0.02. The center-to-limb variation (CLV) is R= 1.74 - 2.43 mu + 3.43 mu^2, where mu is the cosine of the center-to-limbangle. For the disk center, we find R = 2.74, and for near-limb areas with mu =0.3, R equals 1.32. There is only a small dependence of R on the spatialresolution. Our results are rather close to those published three decades ago,but differ significantly from recent magnetographic observations. Anapplication of our results to the important SOHO/MDI magnetic data calibrationissue is discussed. We conclude that the revision of the SOHO/MDI data, basedonly on the comparison of magnetic field measurements in the line pair FeI523.3 nm and FeI 525.0 nm (increasing by a factor of 1.7 or 1.6 on averageaccording to recent publications) is not obvious and new investigations areurgently needed.

Spectro-polarimetric observations of solar magnetic fields and the SOHO/MDI calibration issue