Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 38, issue 6
Articles | Volume 38, issue 6
https://doi.org/10.5194/angeo-38-1237-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-38-1237-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 6
Regular paper
 | 
15 Dec 2020
Regular paper |  | 15 Dec 2020

Estimating the maximum of the smoothed highest 3-hourly aa index in 3 d by the preceding minimum for the solar cycle

Zhanle Du

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Latest update: 24 Oct 2025
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Short summary
Predicting geomagnetic activity intensity for an upcoming solar cycle is important in space weather service and for planning future space missions. The maximum aa geomagnetic index for the solar cycle is found to be well correlated with the preceding minimum. The maximum aa index of solar cycle 25 is estimated to be about 29 % stronger than that of solar cycle 24. The maximum amplitude of the sunspot cycle is much better correlated with high geomagnetic activity than low geomagnetic activity.
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