Coronal mass ejections associated with interplanetary ejecta

In a previous work we have shown that interplanetary ejecta, which sometimes appear behind transient shocks and sometimes appear alone, are related to coronal mass ejections (CMEs) associated with some kind of near-surface solar events (HQ flares or prominence eruptions). In this paper we study the characteristics of these particular CMEs by taking the list of interplanetary shocks with and without ejecta from the Solwind/Helios combined study of CMEs and transient interplanetary shocks. From the same list and the Solwind CME Catalogue we obtained the characteristics of their associated CMEs and compared them. We find that the mean velocity of ejecta-associated CMEs is higher than that of CMEs associated with shocks without ejecta, and belong to different structural classes. We also find that the CMEs of ejects cases are almost always associated with near surface solar activity, while CMEs of no-ejecta cases are rarely accompanied by this kind of activity. Also, the duration of the associated near-surface events is much longer for CMEs related to interplanetary ejecta.