Geodesic
Short Period Cyclic Variations of Solar Activity and Their Geophysical Consequences
Publications of the Department of Astronomy, Tome 13 (1985) no. 1 
D. Djurović; D. Stajić. Short Period Cyclic Variations of Solar Activity and Their Geophysical Consequences. Publications of the Department of Astronomy, Tome 13 (1985) no. 1. http://geodesic.mathdoc.fr/item/PDA_1985_13_1_a2/
@article{PDA_1985_13_1_a2,
     author = {D. Djurovi\'c and D. Staji\'c},
     title = {Short {Period} {Cyclic} {Variations} of {Solar} {Activity} and {Their} {Geophysical} {Consequences}},
     journal = {Publications of the Department of Astronomy},
     pages = {19 - 25},
     year = {1985},
     volume = {13},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/PDA_1985_13_1_a2/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Spectral analysis of the geomagnetic index Aa and Wolf number W has been made. The authors assume that solar activity and geomagnetic field have the common cyclic variations of 2, 3.5 and 5.5 year.