@Article{angeo-44-689-2026,
AUTHOR = {Vandas, M. and Romashets, E. and Imam, T. and Hasan, T. and Majumder, P. and Karki, S.},
TITLE = {Harmonic content of Ap index},
JOURNAL = {Annales Geophysicae},
VOLUME = {44},
YEAR = {2026},
NUMBER = {2},
PAGES = {689--696},
URL = {https://angeo.copernicus.org/articles/44/689/2026/},
DOI = {10.5194/angeo-44-689-2026}
}