Temporal profiles of ion compositions during the August 2017 stream. Panel a: alpha particle to proton ratio He⁺⁺/p+ at a time resolution of 6 s (in blue) and its hourly moving average (in red). Panel b: charge-state ratio at a time resolution of 2 h of C⁶⁺/C⁵⁺ in blue, O⁷⁺/O⁶⁺ in red, and O⁸⁺/O⁶⁺ in yellow. Panel c: iron average charge state at a time resolution of 2 h. Panel d: iron to oxygen abundance ratio at a time resolution of 2 h. The dashed red line denotes the velocity knee between the fast-wind region and the rarefaction region.