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Journal of Physical Studies 13(2), Article 2903 [8 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.2903 OBSERVATIONAL EVIDENCES TO THE 105 G MAGNETIC FIELDS IN ACTIVE REGIONS ON THE SUNV. G. Lozitsky
Astronomical Observatory of the Kyiv Taras Shevchenko National University, |
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New spectral effects in $I \pm V$ line profiles were found indicating the presence of $\sim 10^{5}$\,G magnetic fields in active regions on the Sun. In particular, it was revealed that the FeI 6094.419 line with the negative Lande factor ($g_{\rm Lab} = -0.218$) displays in sunspots the positive Zeeman splitting, i.e. as in the case of positive Lande factor. Two possible reasons for this effect are following: a) presence in sunspot of a strong ($\sim 10^{3}$\,G) magnetic field of opposite polarity but very local in vertical direction ( $≈ 10$\,km), and b) influence of the partial Paschen-Back effect (pPBe) due to superstrong magnetic field of about $≈ 5{\times}10^{5}$\,Ґ$\!$с. Similar conclusion follows from observations of FeI 5434.527 line with very low Lande factor ( $g_{\rm Lab} = - 0.014$). In solar flare of June 16, 1989, this line has reliable differences between $I{+}V$ and $I{-}V$ profiles not only at its core, but also at middle line wings on distances of 0.13-0.18\,{\AA} from line center. Because probable instrumental effects are about 3-5 times less than observed ones, we can suppose the presence of local magnetic field of 0.7-0.9\,MG.
PACS number(s): 96.60.Hv, 96.60.Q-, 96.60.Qe