Image Details
Caption: Figure 2.
Beginning in late 2018 through early 2023, an extended interval of slow solar wind speed (demarcated in pink) was detected at NH. Top: a time series of solar wind speed measurements spanning from 2011 October 23 through 2024 March 15 (21.35–58.42 au) measured by the SWAP plasma sensor on the NH spacecraft. Bottom: corresponding time series of the distance between NH and the Sun and the latitude of NH.
© 2026. The Author(s). Published by the American Astronomical Society.