Stokes Q/I amplitude as a function of limb distance μ = cos(θ). The Sr I data points represent the amplitude of a Gaussian fit to the Q/I line, while the Fe I data points are spectrally and spatially averaged values. We note that the scale is linear and that below μ = 0.2 less pixels were averaged for each data point. The S/N beyond μ = 0.7 is below two and therefore the fitted amplitudes are discarded. For comparison, a range of Sr I polarization values obtained by ZIMPOL and a stationary IRSOL polarimeter (magenta bars show the range of values) are taken from Stenflo et al. (1997).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.