SIMULTANEOUS STOKES-V DIAGNOSTIC OF A SUNSPOT USING MG b AND Fe I LINES


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Abstract

Simultaneous observations of Stokes profiles in photospheric Fe i (630.15 nm and 630.25 nm) and chromospheric Mg i b1 and b2 (518.4 nm and 517.3 nm) lines over a sunspot are presented. Observations were carried out using the Advanced Stokes Polarimeter of HAO/NSO, VTT, SacPeak, U.S.A. The Stokes-V amplitude asymmetries for these lines are analyzed. The values of amplitude asymmetry in Mg b lines are negative in disk-center-side penumbra while they are positive in limb-side penumbra. This trend is similar in nature to photospheric Fe i line observations. Further, the spatial distribution of Stokes-V asymmetry is analyzed using Net Circular Polarization (NCP) maps. The chromospheric and photospheric NCP maps are different in many aspects. These observations with longitudinal magnetic field, estimated using weak field approximation, are discussed in this paper.

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