Polar motion spectra based upon Doppler IPMS and BIH data
Abstract
In comparing polar motion spectra, an oscillation was found at 1.3 cpy which might be due to an Eulerian motion of the solid inner core. An extended 15-year data set was filtered and analyzed to yield a Chandler peak with a period 430.8 solar days and a full width at half-maximum of 0.7 days (Q-600). The data was reanalyzed in overlapping 3-year segments and indicates that the excitation of the Chandler wobble is a discrete process and that periods as long as three years occur in which the driving mechanism is essentially quiescent.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- June 1975
- Bibcode:
- 1975STIN...7527979G
- Keywords:
-
- Earth Movements;
- Earth Rotation;
- Polar Regions;
- Data Processing;
- Earth Core;
- Entropy;
- Euler Equations Of Motion;
- Oscillations;
- Spectrum Analysis;
- Astronomy