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Rotation of a Long-Lived Coronal Hole in Solar Cycle 24

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Abstract

This paper discusses the results of a statistical study of the rotation characteristics of a long-lived giant coronal hole. The study is based on observation data obtained by the Atmospheric Imaging Assembly in the Fe XII 19.3 nm line aboard the Solar Dynamics Observatory spacecraft during the period from June 2015 to March 2017; this was 24 Carrington revolutions. Four stages of the development of a coronal hole are considered separately: formation, two phases of a developed coronal hole, and the final phase. It has been found that the average rotation rate at a latitude of 40° is close to the standard speed at the beginning (12.75°/day) and in the first phase of maximum development (13°/day); it is lower in the second phase of maximum development (11.7°/day) and at the end of its existence (12.5°/day). A slight increase in velocity at the final stage is associated with the restructuring of the coronal hole. According to modern theories, the rotation of the solar corona reflects the rotation of the subphotospheric layers. The higher layers of the corona reflect the rotation of the deeper layers of the Sun. The results obtained in our work show that the rotation rate of a giant coronal hole in the maximum phase of its development is greater than the rotation rate of the solar disk. Perhaps this indicates that coronal holes can be associated with deep solar layers through the configuration of the global magnetic field and that the source of coronal hole formation is deeper than the source of the background field.

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5. ACKNOWLEDGMENTS

SDO is a project of the NASA Living With a Star program. We are grateful to the Joint Science Operation Center (JSOC) team for the opportunity to use SDO/AIA data in our study.

Funding

The work was supported by the Ministry of Science and Higher Education of the Russian Federation, NIR no. 1021051101548-7-1.3.8.

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  1. Crimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Crimea, Russia

    O. A. Andreeva & V. M. Malaschuk

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  1. O. A. Andreeva
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  2. V. M. Malaschuk
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Correspondence to O. A. Andreeva or V. M. Malaschuk.

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Andreeva, O.A., Malaschuk, V.M. Rotation of a Long-Lived Coronal Hole in Solar Cycle 24. Geomagn. Aeron. 63, 449–455 (2023). https://doi.org/10.1134/S0016793223600297

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