| Abstract : | Coronal active regions are known to play an important role in the outer solar atmospheric dynamics. We have studied the coronal active regions using Hinode/Extreme ultraviolet Imaging Spectrometer data by obtaining their line profiles in Fe XII 195.12 Å line. We obtain the intensity, linewidth, Doppler velocity and the centroid of various active regions for a period of 13 years which covers the last two years of the 23rd solar cycle and the 24th solar cycle. These active regions are spread globally over the Sun covering the limb and the disc. The histograms of Doppler velocity and centroid are found to behave in 6 different ways relatively. The centroid is found to shift in majority of the cases. The intensity and the line width are skewed in majority of the cases. The line width is found to follow a second-degree polynomial in its variation with the Doppler velocity and the centroid whose trends are alike for a given data set. We further extend our analysis to study these shifts and correlations in the coronal holes. We plan to present a comparative study of the coronal active regions and the coronal holes. The implications of these results on the coronal heating and dynamics are discussed.
|
