Table 1.

The two main instruments currently providing magnetograms in the photosphere.

Instrument SDO/HMI Hinode/SOT/SP
Method Images in six wavelengths and four polarization states Spatial and spectral scan of region
Spectral lines Fe I at 617.33 nm Fe I doublet at 630.15 nm and 630.25 nm
Field of view Full disk Active region
Spatial resolution 0.5 arcsec 0.32 arcsec
Time resolution 12 min ≈45 min (scan duration)

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