Geodesic
A Quasi Biennal Oscillation in Solar Activity and Geophysical Phenomena: Preliminary results
Publications of the Department of Astronomy, Tome 18 (1990) no. 1.

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The Quasi Biennal Oscillation (QBO) is well known in several meteorological parameters and has been also identified by several authors in the Earth rotation fluctuations. In this paper we first indicate for the atmospheric angular momentum and Earth rotation variations, the unstable nature of QBO both in phase and amplitude. In a second step indications on the existence of QBO are identified in solar activity and geomagnetic index (Aa). 
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     author = {D. Djurovi\'c and P. P\^aquet},
     title = {A {Quasi} {Biennal} {Oscillation} in {Solar} {Activity} and {Geophysical} {Phenomena:} {Preliminary} results},
     journal = {Publications of the Department of Astronomy},
     pages = {5 - 20},
     publisher = {mathdoc},
     volume = {18},
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     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/PDA_1990_18_1_a0/}
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D. Djurović; P. Pâquet. A Quasi Biennal Oscillation in Solar Activity and Geophysical Phenomena: Preliminary results. Publications of the Department of Astronomy, Tome 18 (1990) no. 1. http://geodesic.mathdoc.fr/item/PDA_1990_18_1_a0/