Issue |
A&A
Volume 656, December 2021
Solar Orbiter First Results (Cruise Phase)
|
|
---|---|---|
Article Number | L2 | |
Number of page(s) | 6 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202039870 | |
Published online | 14 December 2021 |
Letter to the Editor
Suprathermal particles from corotating interaction regions during the first perihelion pass of Solar Orbiter
1
Johns Hopkins Applied Physics Lab., Laurel, MD 20723, USA
e-mail: Robert.Allen@jhuapl.edu
2
Space Research Group, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
3
Institut für Experimentelle und Angewande Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
4
Now at DSI Datensicherheit GmbH, Rodendamm 34, 28816 Stuhr, Germany
5
Now at Deutsches Elektronen-Synchrotron (DESY), Platanenallee 6, 15738 Zeuthen, Germany
6
Now at German Aerospace Center (DLR), Department of Extrasolar Planets and Atmospheres, Berlin, Germany
7
Now at Max-Planck-Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
8
Now at Univ. Colorado/LASP, Boulder, CO, USA
Received:
6
November
2020
Accepted:
20
December
2020
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 4He spectral slopes are observed between Solar Orbiter and ACE. Additionally, the radial gradients of 226−320 keV/nuc 4He 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.
Key words: acceleration of particles / solar wind / Sun: abundances / interplanetary medium / shock waves
© R. C. Allen et al. 2021
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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