Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A

Abstract

The addition of Parker Solar Probe (PSP) to the Heliophysics System Observatory has allowed for the unprecedented ability to study Corotating Interaction Regions (CIRs) at multiple radial distances without significant temporal/longitudinal variations. On September 19, 2019, PSP observed a CIR at $\sim$0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at $\sim$1 au, allowing for an unambiguous assessment of the radial evolution of a single CIR. Bulk plasma and magnetic field signatures of the CIR evolve in a fashion characteristic to previous observations; however, the suprathermal ions are enhanced over a larger longitudinal range at PSP than at STEREO-A, although at much lower intensities. The longitudinal spread appears to be largely a consequence of magnetic field line topology at CIRs between the compressed slow solar wind upstream and high-speed stream following the CIR, underscoring the importance of the large-scale topology of these structures.

arXiv commentAccepted manuscript; 13 pages, 4 figures. Published version: https://doi.org/10.1029/2020GL091376. Citation errors in the accepted manuscript are corrected. Minor typos corrected. Figure 2 caption panel labels (g, h) corrected

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Cited by in corpus (5)

• Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
• A living catalog of stream interaction regions in the Parker Solar Probe era
• A Self-consistent Simulation of Proton Acceleration and Transport Near a High-speed Solar Wind Stream
• Multi-spacecraft Study of the Solar Wind at Solar Minimum: Dependence on Latitude and Transient Outflows
• Parker Solar Probe observations of solar energetic particle (SEP) events with inverse velocity arrival (IVA) features