Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aspl.book.....g&link_type=abstract
NASA Tech. Memo., NASA-TM--79593, 13 p.
Physics
Earth Axis, Earth Tides, Elevation Angle, Latitude, Polar Wandering (Geology), Stars, Tesseral Harmonics, Axes Of Rotation, Least Squares Method, Power Spectra, Sidereal Time, Time Series Analysis
Scientific paper
Star pair latitude observations forming the basis for the pole positions reported by the International Polar Motion Service (IPMS) are processed to produce a mean pole position. However, the time series of raw observations contains high frequency information which is lost in the calculation of the mean pole. Analysis of 2931 star pair observations reveals a possible large excitation at one cycle per solar day. The average power level in the frequency band of the tesseral tides is seen to be high, although the peaks do not occur at the expected tidal frequencies.
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