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We report on a detailed radiative transfer modeling of the observedscattering polarization in the H-alpha line, which allows us to inferquantitative information on the magnetization of the quiet solar chromosphere.Our analysis suggests the presence of a magnetic complexity zone with a meanfield strength <B> > 30 G lying just below the sudden transition region to thecoronal temperatures. The chromospheric plasma directly underneath is veryweakly magnetized, with <B> ~ 1 G. The possible existence of this abrupt changein the degree of magnetization of the upper chromosphere of the quiet Sun mighthave large significance for our understanding of chromospheric (and, therefore,coronal) heating.

On the Probable Existence of an Abrupt Magnetization in the Upper Chromosphere of the Quiet Sun