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Allen, R. C.; Mason, G. M.; Ho, G. C.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Andrews, G. B.; Berger, L.; Boden, S.; Cernuda, I.; Espinosa Lara, F.; Freiherr von Forstner, J. L.; Gómez-Herrero, R.; Hayes, J. R.; Kulkarni, S. R.; Lees, W. J.; Martin, C.; Pacheco, D.; Polo, O. R.; Prieto, M.; Ravanbakhsh, A.; Sánchez-Prieto, S.; Schlemm, C. E.; Seifert, H.; Terasa, J. C.; Tyagi, K.; Xu, Z.; Yedla, M.
Astronomy and astrophysics (Berlin), 12/2021, Volume: 656Journal Article
The first orbit of Solar Orbiter provided comprehensive measurements of six corotating interaction regions (CIRs) within 1 au. Five of these CIRs were also observed by ACE at 1 au, allowing for comparisons of the suprathermal ion intensities and spectra at different radial distances. Only subtle modulations of the 4 He spectral slopes are observed between Solar Orbiter and ACE. Additionally, the radial gradients of 226−320 keV/nuc 4 He ion intensities between Solar Orbiter and ACE are similar to that of 1.53 MeV H reported by Van Hollebeke et al. (1978, J. Geophys. Res., 83, A10). These observations provide a new addition to the study of the radial dependence of CIR-associated suprathermal ions in the inner heliosphere.
