Polar regions activity and the prediction of the height of the solar cycle 25 Solar Cycle 25

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Published: Jun 15, 2022
Abstract views: 468
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DOI: https://doi.org/10.34898/aat.vol3.iss2.pp12-16
Keywords:
solar cycle cycle 25 polar regions activity polar faculae X-ray bright points macro-spicules polar mini ejections chromospheric prolateness

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Serge Koutchmy
Institut d’Astrophysique de Paris, CNRS and Sorbonne University, UMR 7095-98 Bis Boulevard Arago, Paris 75014, France
Boris Filippov
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk 108840, Russia
E. Tavabi
Physics Department, Payame Noor University (PNU), 19395-3697, Tehran, I. R. of Iran
J-C. Noëns
Obs. Pic du Midi, Association des O.A., France
O. Wurmser
Association des O.A., PdM, France

Abstract

The forthcoming solar cycle (SC) 25 was believed to be rather low when the sunspot number (SN) is used as a measure of the activity level. The most popular prediction was made by the NOAA/NASA Solar Cycle 25 Prediction Panel in 2019, including works based on dynamo-type models. However, we discovered that the height of SC25 could be high, using different observations for measurements of the level of the polar-region activity above the limb at high latitudes several years before the start of SC25 and also after its beginning in 2020. The polar-region activity, which we consider, seems to be related to the polar coronal-hole (CH) activity, and it was significantly higher before SC25 than before SC24. It is also possibly reflected in the so-called chromospheric prolateness observed at solar minimum. Accordingly, we suggest that SC25 could indeed be significantly higher than SC24, which was a very low SN cycle.

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How to Cite
Koutchmy S., Filippov B., Tavabi E., et al., 2022. Acta Astrophysica Taurica, vol. 3, no. 2, pp. 12–16. DOI: 10.34898/aat.vol3.iss2.pp12-16
Issue
Vol. 3 No. 2 (2022)
Section
Magnetism and activity of the Sun and stars – 2021 Conference proceedings
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