Authors: Vamsee Krishna Jagarlamudi (Johns Hopkins University Applied Physics Laboratory), Carlos Braga (Johns Hopkins University Applied Physics Laboratory), Nour Rawafi (Johns Hopkins University Applied Physics Laboratory), Angelos Vourlidas (Johns Hopkins University Applied Physics Laboratory)

Parker Solar Probe (PSP) has flown through numerous Sub-Alfvenic regions since April 28, 2022. In this study, we present the analysis of the long Sub-Alfvenic intervals (> 10 min) observed in Parker Solar Probe’s perihelion encounter 10. All the Sub-Alfvenic intervals show a common feature of considerable density drop, very low plasma β, and low levels of magnetic field fluctuations. Interestingly, there are no switchbacks observed in the analyzed Sub-Alfvenic regions. We observed that the majority of these regions are observed due to density depletion. We have analyzed the possibility of Sub-Alfvenic wind interval being created due to the Coronal Mass Ejections (CMEs) (Either due to the ICMEs or Streamer depletion happening after the CMEs). Our analysis has shown that all the long Sub-Alfvenic wind intervals observed in Encounter 10 have a CME influence associated with them.