Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arep...41..682b&link_type=abstract
Astronomy Reports, Volume 41, Issue 5, September 1997, pp.682-692
Astronomy and Astrophysics
Astronomy
5
Scientific paper
Polarization observations in the lambda 5303 Angstroms FeXIV line during the eclipse of July 11, 1991 are presented. A new polarization map probing somewhat greater heights in the corona is constructed, and the distribution of polarization position angles is given. Low degrees of polarization p are obtained in the equatorial regions; at low heights, they are consistent with the results of out-of-eclipse observations. The values for p are higher in regions of high-latitude streamers, and increase substantially with distance from the limb. The method used in the analysis made it possible to separate the line emission into two components (associated with exci- tation due to electron collisions and with resonant scattering of the photospheric radiation), and also to estimate the density and overall extent of the emitting region. The observed values of p are consistent with current ideas about the corona if the relative density of the FeXIV ion is 2 x 10^-5 and the rate of excitation by electron collisions is 5 x 10^-9 cm^3/s. The possible role of magnetic fields is briefly discussed.
Badalyan Olga G.
Livshitz M. A.
Sykora Jan
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