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The Hanle effect in strong spectral lines is the physical mechanism thatshould be increasingly exploited for quantitative explorations of the magnetismof the quiet solar chromospheric plasma. Here we show, by means of multilevelradiative transfer calculations and new spectropolarimetric observations, thatthe amplitude and shape of the scattering polarization profiles of the H-alphaline is very sensitive to the strength and structure of the chromosphericmagnetic field. The interpretation of the observations in terms ofone-dimensional radiative transfer modeling suggests that there is an abruptmagnetization in the upper chromosphere of the quiet Sun.

Scattering polarization and the Hanle effect in H-alpha as a probe of chromospheric magnetism: Modeling vs. Observations