Long term components in polar motion
| Autor: | E. PROVERBIO, V. QUESADA |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1972 |
| Předmět: | |
| Zdroj: | Annals of Geophysics, Vol 25, Iss 1, Pp 37-54 (1972) |
| Druh dokumentu: | article |
| ISSN: | 1593-5213 2037-416X |
| DOI: | 10.4401/ag-5101 |
| Popis: | The analysis of a long series of l a t i t u d e observations carriedout in t h e International Latitude Station has allowed a very careful studyof forced motion due to meteorological effects and of t h e remaining motionascribed to the free nutation of an elastic Earth. The discussion of theseobservations has, however, led to the discovery of the existence of longterm components in polar motion (confirmed by Proverbio et al. (u ).In this work, the latitudes observed in t h e period 1900.0 - 1969.0 reducedto a single homogeneous system are analyzed separately for t h e five stationsof the ILS. The analysis of this q u a n t i t y points up t h e existence of twodifferent long term components in polar motion of about 16 and 26 years.One possible interpretation of these phenomena is based on " beat " phenomenabetween the n u t a t i o n of the mantle and the inner core of the E a r t h |
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