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Some of the major challenges faced in understanding the early evolution ofCoronal Mass Ejections (CMEs) are due to limited observations in the innercorona ($<\,3$ R$_{\odot}$) and the plane of sky measurements. In this work, wehave thus extended the application of the Graduated Cylindrical Shell (GCS)model to the inner coronal observations from the ground--based coronagraphK--Cor of the Mauna Loa Solar Observatory (MLSO) along with the pair ofobservations from COR--1 onboard the Solar Terrestrial Relations Observatory(STEREO). We study the rapid initial acceleration and width expansion phase of5 CMEs in white-light in the lower heights. We also study the evolution of themodelled volume of these CMEs in inner corona and report for the first time, apower law dependence of the CME volume with distance from the Sun. We furtherfind the volume of ellipsoidal leading front and the conical legs followdifferent power laws, thus indicating differential volume expansion through aCME. The study also reveals two distinct power laws for the total volumeevolution of CMEs in the inner and outer corona, thus suggesting differentexpansion mechanisms at these different heights. These results besides aidingour current understanding on CME evolution, will also provide betterconstraints to CME initiation and propagation models. Also, since the loss ofSTEREO-B (and hence COR--1B data) from 2016, this modified GCS model presentedhere will still enable stereoscopy in the inner corona for the 3D study of CMEsin white-light.

On the Variation of Volumetric Evolution of CMEs from Inner to Outer Corona