Abstract
In order to investigate Coronal Mass Ejections (CMEs) in terms of either its pattern of occurrence or periodicities a new combination of techniques has been applied. It consists in the selection of a CMEs onset time continuous series obtained from the CDAW catalog for the years 2000-2012, covering a full cycle interval. The analysis has been made by a combination of: series spectral decomposition, periodic known components removal, and wavelet spectrum (WS) of the residual series. Spectral components are searched within the 95% confidence level. Application of WS becomes possible the identification of any component, and how long as well as when it is present in the series. Known periodic components identified in this and other studies are: 11-year, 6-year, 2.8-year, 1-year. Also, a 27-day component is well known. After removal of all known components, this investigation permitted us to identify a new component within the range of 16-64 days in the CMEs occurrence series. Beyond 64 days no component is observed. Identified component is intermittent in nature mainly from maximum up to the minimum of the 23rd solar cycle which corresponds to the interval 2000-2007. Then, it practically disappears till 2011 and 2012 when show up again. It has to be emphasized that the 16-64 days component became persistent in the interval 2006-2007. Interpretation of these is under preparation and will be published somewhere else.
