Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 44, issue 2
Articles | Volume 44, issue 2
https://doi.org/10.5194/angeo-44-689-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-44-689-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 44, issue 2
Regular paper
 | 
28 Jul 2026
Regular paper |  | 28 Jul 2026

Harmonic content of Ap index

Marek Vandas, Evgeny Romashets, Tasmina Imam, Tanvir Hasan, Pranab Majumder, and Sanjay Karki

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Short summary
Fourier spectral analysis is applied to the planetary geomagnetic index $A_p$ for the February 2001, 2003, and 2017 time intervals. 
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