Authors: Lidiya Y. Ahmed1,2 , Michael L. Stevens1, Sam Badman1, Yeimy Rivera1, Kristoff Paulson1, Srijan Das1. 1 Smithsonian Astrophysical Observatory 2 Harvard University

Parker Solar Probe (Parker) achieved several unique observational alignments with Earth and the Solar Orbiter (SolO) during Encounter 19, in the lead-up to the 2024 April 8 total solar eclipse over North America. Significantly, this encounter comprises five well-measured crossings of the same corotating stream structure as SolO and Wind that together cover solar distances from 11 to 210 R☉, which allows for coordinated observations across missions. 

Our study investigates the spatio-temporal evolution of solar wind streams using observations from Parker, SolO, and Wind, in the vicinity of the heliospheric current sheet sampled during five crossings at different distances in the inner heliosphere. Dynamic Time Warping (DTW) is an algorithm that allows for stretching and compression of time-series to align similar structures. We use DTW to map traversal time series using the current sheet crossings as alignment markers, aiming to understand the temporal and spatial evolution of the solar wind. Using the results from our mappings, we investigate the radial evolution of the angular scale of switchback patches to assess if they are conserved or deformed.