ИСТИНА

So far, both linear and circular polarization measurements in prominences are rare. Problems of near-limb “weak” magnetic field measurements are well known for practitioners. An approach for 2D linear polarimetry in prominences with actual accuracies <2% and <2 degrees is briefly described. The developed analysis technique of I, Q, U Stokes parameters is aimed at obtaining the 2D distributions of the linear polarization degree, the polarization angle and the sign of the angle which we refer the polarization images similar to conventional ones (2D distributions of I Stokes parameter). The key components are Stokes vector presentation of the light, reduction of random error by the use of “statistics”, reduction of systematic errors by the solution of the over-determined system of 24 equations by least squares. Broad-band filter eclipse linear polarimetry in prominences were used to test the approach. Polarization images of the sign of the angle of H-alpha prominences exclude the direct classification of these objects as prominences with either normal or inverse polarity and demonstrate opportunities for non-eclipse coronagraphic filter linear polarimetry as well. Parameters of feeding optics, analyzers and narrow band filters are estimated.