CAOSP abstracts, Volume: 32, No.: 1, year: 2002
- Author(s): BADALYAN, O.G.; OBRIDKO, V.N.; SYKORA, J.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso, vol. 32, no. 1, p. 49-61.
- Date: 04/2002
- Title: Direction of the coronal green line polarization as derived from the eclipse measurements
- Keyword(s): CORONAL GREEN LINE, POLARIZATION CHARCTERISTICS, DIRECTION OF POLARIZATION
- Pages: 49 -- 61
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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