The variation in the response of solar full-disc magnetographs

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Volume 688 (August 2024)

A&A, 688 (2024) A48

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Table 3.

The uncertainty in measured solar magnetism due to the time variation in instrument response.

Comparison	$σ_{B_{los}, time}$ ${\sigma_{{{B_{\text{los}}}}{\rm,time}}}$	$σ_{ϕ_{tot}, time}$ ${{\sigma_{{{\phi_{\text{tot}}}}{\rm,time}}}}$
	[%]	[%]
MDI(1)-SPM	3.56	6.15
MDI(2)-SPM	1.57	1.94
MDI(2)-VSM(1)	2.47	4.17
MDI(2)-VSM(2)	1.18	1.73
HMI-VSM(2)	0.561	0.813
HMI-VSM(3)	0.807	1.10
HMI-MDI(2)	0.733	1.15

Notes. For each instrument-instrument comparison, the proportional uncertainty in the LOS magnetic flux density, $σ_{B_{los}, time}$ ${\sigma_{{{B_{\text{los}}}}{\rm,time}}}$ and disc-integrated photospheric magnetic flux, $σ_{ϕ_{tot}, time}$ ${{\sigma_{{{\phi_{\text{tot}}}}{\rm,time}}}}$ due to the time variation in instrument response. The values are scaled by a factor of 100 to express them as percentages. See Sect. 3.1 for details.

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