Ca II H and K lines produce circular polarization above 10% in strong fields (detectable by CHROMIS) but linear polarization below 1.7%, enabling reliable line-of-sight magnetic field inference in the upper chromosphere via the weak-field approximation.
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The magnetic sensitivity of the Ca II H and K lines
Ca II H and K lines produce circular polarization above 10% in strong fields (detectable by CHROMIS) but linear polarization below 1.7%, enabling reliable line-of-sight magnetic field inference in the upper chromosphere via the weak-field approximation.