Characteristics of the solar coronal line profiles from Fabry-Perot interferometric observations

Abstract

This article reports the analysis of a set of Fabry–Perot interferograms that were studied to probe the physical parameters of the inner solar corona. The observations were carried out in the coronal green line, Fe XIV 5302.86 Å, during the total solar eclipse of 21 June 2001 that occurred in Lusaka, Zambia. The study was performed in the radial range of 1.1--1.5 R⊙ and examines the Doppler velocity, half-width, centroid, and asymmetry and their correlations with each other at various points in the corona. We found that 59% of the line profiles are blueshifted, 34% are single components, and only 7% are redshifted. The variations in half-width and Doppler velocity with respect to coronal height have a large scatter and show no significant changes. We found that the variation in half-width with Doppler velocity or centroid follows a parabolic trend with a weak correlation, whereas the relation between half-width and asymmetry is inconclusive. These results may provide more insight into the coronal dynamics and help in understanding the physical problems in the corona.