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A particularly interesting line for exploring the physical conditions of thequiet solar chromosphere is H$\alpha$, but its intensity profile ismagnetically insensitive and the small circular polarization signaturesproduced by the longitudinal Zeeman effect come mainly from the underlyingphotosphere. Here we show that the Hanle effect in H$\alpha$ providesquantitative information on the magnetism of the quiet chromosphere. To thisend, we calculate the response function of the emergent scattering polarizationto perturbations in the magnetic field.

On the Sensitivity of the H$\alpha$ Scattering Polarization to Chromospheric Magnetism