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The solar wind, when measured close to 1 au, is found to flow mostly radiallyoutward. There are, however, periods when the flow makes angles up to15$^\circ$ away from the radial direction, both in the east-west andnorth-south directions. Stream interaction regions (SIRs) are a common cause ofeast-west flow deflections. Coronal mass ejections (CMEs) may be associatedwith non-radial flows in at least two different ways: 1) the deflection of thesolar wind in the sheath region, especially close to the magnetic ejecta frontboundary, may result in large non-radial flows, 2) the expansion of themagnetic ejecta may include a non-radial component which should be easilymeasured when the ejecta is crossed away from its central axis.  In this work, we first present general statistics of non-radial solar windflows as measured by STEREO/PLASTIC throughout the first 13 years of themission, focusing on solar cycle variation. We then focus on the largerdeflection flow angles and determine that most of these are associated withSIRs near solar minimum and with CMEs near solar maximum. However, we find noclear evidence of strongly deflected flows, as would be expected if largedeflections around the magnetic ejecta or ejecta with elliptical cross-sectionswith large eccentricities are common. We use these results to develop a betterunderstanding of CME expansion and the nature of magnetic ejecta, and point toshortcomings in our understanding of CMEs.

Investigating The Cross-section of Coronal Mass Ejections Through the Study of Non-Radial Flows with STEREO/PLASTIC