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Radial Evolution of a CIR: Observations From a Nearly Radially Aligned Event Between Parker Solar Probe and STEREO‐A
Author(s) -
Allen R. C.,
Ho G. C.,
Mason G. M.,
Li G.,
Jian L. K.,
Vines S. K.,
Schwadron N. A.,
Joyce C. J.,
Bale S. D.,
Bonnell J. W.,
Case A. W.,
Christian E. R.,
Cohen C. M. S.,
Desai M. I.,
Filwett R.,
Goetz K.,
Harvey P. R.,
Hill M. E.,
Kasper J. C.,
Korreck K. E.,
Lario D.,
Larson D.,
Livi R.,
MacDowall R. J.,
Malaspina D. M.,
McComas D. J.,
McNutt R.,
Mitchell D. G.,
Paulson K. W.,
Pulupa M.,
Raouafi N.,
Stevens M. L.,
Whittlesey P. L.,
Wiedenbeck M.
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl091376
Subject(s) - solar wind , physics , spacecraft , observatory , astrophysics , magnetic field , astronomy , quantum mechanics
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.