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 ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼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.
Versions
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BibTeX
@misc{allen2026radial,
title = {{Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A}},
author = {R. C. Allen and G. C. Ho and G. M. Mason and G. Li and L. K. Jian and S. K. Vines and N. A. Schwadron and C. J. Joyce and S. D. Bale and J. W. Bonnell and A. W. Case and E. R. Christian and C. M. S. Cohen and M. I. Desai and R. Filwett and K. Goetz and P. R. Harvey and M. E. Hill and J. C. Kasper and K. E. Korreck and D. Lario and D. Larson and R. Livi and R. J. MacDowall and D. M. Malaspina and D. J. McComas and R. McNutt and D. G. Mitchell and K. W. Paulson and M. Pulupa and N. Raouafi and M. L. Stevens and P. L. Whittlesey and M. Wiedenbeck},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.02224},
eprint = {2611.02224},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.02224},
}
RIS
TY - UNPB
TI - Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO-A
AU - R. C. Allen
AU - G. C. Ho
AU - G. M. Mason
AU - G. Li
AU - L. K. Jian
AU - S. K. Vines
AU - N. A. Schwadron
AU - C. J. Joyce
AU - S. D. Bale
AU - J. W. Bonnell
AU - A. W. Case
AU - E. R. Christian
AU - C. M. S. Cohen
AU - M. I. Desai
AU - R. Filwett
AU - K. Goetz
AU - P. R. Harvey
AU - M. E. Hill
AU - J. C. Kasper
AU - K. E. Korreck
AU - D. Lario
AU - D. Larson
AU - R. Livi
AU - R. J. MacDowall
AU - D. M. Malaspina
AU - D. J. McComas
AU - R. McNutt
AU - D. G. Mitchell
AU - K. W. Paulson
AU - M. Pulupa
AU - N. Raouafi
AU - M. L. Stevens
AU - P. L. Whittlesey
AU - M. Wiedenbeck
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.02224
UR - https://arxiv.org/abs/2611.02224
AB - 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 ∼0.5 au when it was nearly radially aligned with the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft at ∼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.
ER -