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Fig. 2

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Magnetic energy, Eq. (16), normalized to the energy of the potential field having the same distribution of normal field on the boundaries (black lines) or to the energy of the reference field (orange lines), as a function of the amplitude δ of the nonsolenoidal term, Eq. (14). Two models for the divergence are shown according to Eq. (15). Each panel shows the results of a test field: a) the potential field of a double dipole, BDD; b) the TD model, BTD; c) the MHD model, BMHD; d) the NLFFF model of the nonpreprocessed magnetogram of AR 11158, BEx1; e) the NLFFF model of the preprocessed magnetogram of AR 11024, BEx2PP; f) the NLFFF model of the nonpreprocessed magnetogram of AR 11024, BEx2. An important change of scale of both axes is present between the top and the bottom rows.

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