CAOSP abstracts, Volume: 32, No.: 1, year: 2002

Abstract: Investigation of the polarization in the coronal FeXIV lambda 530.3 nm line is continued by exploiting the 11 July 1991 eclipse observation. In this paper, we analyze the direction of the plane of polarization represented by deviations of the magnetic vector from the radial directions -- angle beta. The relation of this angle to the other polarization charcteristics is discussed. It has been found that beta is small in the coronal features characterized by a high degree of polarization (streamers and coronal holes). With the decreasing polarization (e.g., when the equatorial objects of enhanced activity are considered) the magnitude of beta increases significantly. The extreme values of beta are observed within the coronal features related to the active regions in the photosphere. The distribution of beta in magnitude is distinctly shifted from zero to positive values. This means that, in the most part of the corona on July 11, 1991, the magnetic vector deviates from radiality clockwise. In connection with the revealed drastic discrepancy between the observed direction of the plane of polarization and the generally accepted theoretical conceptions (Badalyan et al., 2001; Badalyan, 2002), the obtained result may be worth considering when developing a new theory of the origin of polarized radiation in the coronal green line.

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