
An investigation carried out at the IAC has demonstrated that the apparently non-magnetic regions of the solar photosphere (the innermost region of the atmosphere of the Sun) are instead permeated by a "chaotic" magnetic field of very significant intensity, which implies the presence of a vast amount of "hidden" magnetic energy in the quiet solar photosphere. This investigation required to develop first a novel diagnostic technique of magnetic fields, which is based on three-dimensional numerical simulations of the Hanle effect in atomic and molecular lines. For more information see the
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