Solar coronal mass ejections on decay phase of solar cycles 23 and 24.

We investigate the coronal mass ejections (CME) occurring during spotless days (SLD) during the descending phases of solar cycles 23 (2004‑2008) and 24 (2015‑2019). The fraction of CMEs that occurred on SLDs is found to be 14 and 11%, for cycles 23 and 24, respectively, compared to the total CMEs that occurred in the aforementioned durations. A comparative analysis of CMESLD kinematics of cycle 23 and 24 shows that the weakest cycle 24 has wider and more massive events.In a repository, we include parameters estimated for every analysed CME. These parameters are:date and time (columns 1 & 2)central position angle (column 3)angular width (column 4)the linear speed obtained by fitting a straight line to the height–time measurements made at the fastest section of CMEs (column 5)quadratic speed obtained by fitting a parabola and evaluating the speed at the time of final height measurement (column 6)speed obtained as in column 6 but evaluated when the CME is at a height of 20 solar radii (column 7)acceleration obtained from the quadratic fit to the height–time measurements (column 8)mass and kinetic energy of the CME (columns 9 & 10)position angle at which the height–time measurements are made (column 11)heliographic coordinates of a CME source region (column 12)