Seasonal oscillations in length-of-day: Paper presented at the XXI General 
Assembly European Geophysical Society The Hague, The Netherlands 6-10 May, 1996

Höpfner, Joachim

doi:10.48440/gfz.b103-960032

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Seasonal oscillations in length-of-day: Paper presented at the XXI General Assembly European Geophysical Society The Hague, The Netherlands 6-10 May, 1996

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Höpfner, Joachim
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Höpfner, J. (1996): Seasonal oscillations in length-of-day: Paper presented at the XXI General Assembly European Geophysical Society The Hague, The Netherlands 6-10 May, 1996, (Scientific Technical Report STR ; 96/03), Potsdam : GeoForschungsZentrum GFZ, 14 p.
https://doi.org/10.48440/gfz.b103-960032

Cite as: https://gfzpublic.gfz.de/pubman/item/item_8430

Abstract

Variations of annual and semiannual oscillations in rotation parameters have been investigated on the basis
of length-of-day (LOD) as well as atmospheric-angular-momemtum (AAM) time series. These oscillations were deter-
mined using band-pass filters. In order to show the character of variations of seasonal oscillations, amplitudes, phases
and periods were computed by a least-squares adjustment with the method of modified harmonic analysis at quarterly
intervals. In addition, the seasonal imbalances in LOD and AAM budgets were determined and analysed in a similar way.
These discrepancies were corrected for tidally excited effects. The non-atmospheric oscillations without the annual tide
effect Sa and the semiannual tide effect Ssa have changeable amplitudes between 0.02 and 0.10 ms.