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Twenty-five years ago, enigmatic linear polarization signals were discoveredin the core of the sodium D1 line. The only explanation that could be foundimplied that the solar chromosphere is practically unmagnetized, incontradiction with other evidences. This opened a paradox that has challengedphysicists for many years. Here we present its solution, demonstrating thatthese polarization signals can be properly explained in the presence ofmagnetic fields in the gauss range. This result opens a novel diagnostic windowfor exploring the elusive magnetism of the solar chromosphere.

Solving the paradox of the solar sodium D1 line polarization