Abstract
The analysis of a long series of l a t i t u d e observations carried out in t h e International Latitude Station has allowed a very careful study of forced motion due to meteorological effects and of t h e remaining motion ascribed to the free nutation of an elastic Earth. The discussion of these observations has, however, led to the discovery of the existence of long term components in polar motion (<•• 8). These results have recently been confirmed by Proverbio et al. (u ). In this work, the latitudes observed in t h e period 1900.0 - 1969.0 reduced to a single homogeneous system are analyzed separately for t h e five stations of the ILS. The analysis of this q u a n t i t y points up t h e existence of two different long term components in polar motion of about 16 and 26 years. One possible interpretation of these phenomena is based on beat phenomena between the n u t a t i o n of the mantle and the inner core of the E a r t h
Highlights
INTRODUCTION1.1 - Analysis of the latitude observations made in the International Latitude Service Stations starting from 1899 has supplied important knowledge on polar motion and on the causes of this motion, on the causes of the Chandler component owing to the free nutation of the elastic Earth
SUMMARY. — T h e analysis of a long series of latitudeobservations carried o u t in theInternationalLatitudeStationhas allowed averycarefulstudy of forced motiondueto meteorological effects a n d of theremainingmotion ascribed to thefreenutation of an elastic Earth
1.1 - Analysis of the latitude observations made in the International Latitude Service Stations starting from 1899 has supplied important knowledge on polar motion and on the causes of this motion, on the causes of the Chandler component owing to the free nutation of the elastic Earth
Summary
1.1 - Analysis of the latitude observations made in the International Latitude Service Stations starting from 1899 has supplied important knowledge on polar motion and on the causes of this motion, on the causes of the Chandler component owing to the free nutation of the elastic Earth. The possibility prospected by the two frequency model of a hypothetical coupling between the two different layers of the mantle or core as a basis of beat phenomena opens up notable prospects for explaining the mechanism of the Chandler wobble, b u t to explain the existence of long term polar motion variations recently reported on. 1.2 - The existence of long term polar motion variations reported by Hattori (°) was pointed up by Markowitz (8). Proverbio et al ( l l ) in analysing the amplitude spectrum as a function of the periods, confirmed the existence of this long term polar motion component, which can be represented by the equations [1]
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