The line-ratio method applied to vectormagnetographic measurements

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetic Signatures, Solar Magnetic Field, Stokes Theorem (Vector Calculus), High Resolution, Spatial Resolution, Zeeman Effect

Scientific paper

Since solar magnetic fields are inhomogeneous, the averaging of Stokes parameter I within the entrance slit of the magnetograph is different from averaging Stokes Q0 and V, because the former also contains light from nonmagnetic regions, while the latter only contain light from magnetic regions. If the magnetographic calibration functions are calculated for homogeneous magnetic fields, errors arise when they are used to reduce measurements of inhomogeneous fields. Here, therefore, the line-ratio method is used to transform magnetographic measurements into the parameters of the magnetic vector field. The Q ratios and the V ratios of two carefully selected lines are from errors of this kind. This is also the case for the Q ratios in line core and line wings in single-line magnetographs.

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