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Sub-Daily Earth Rotation during the Epoch '92 CampaignEarth rotation measurements were obtained using Global Positioning System (GPS) data for 11 days during the Epoch '92 campaign in the Summer of 1992. Earth orientation was measured simultaneously with several very long baseline interferornetry (VLBI) networks. These data were processed to yield both GPS and VLBI estimates of UT1 with 3-hour time resolution, which were then compared and analyzed. The high frequency behavior of both data sets is similar, although drifts between the two series of approx.0,1 ms over 2-5 days are evident, Models for tidally induced UT1 variations and estimates of atmospheric angular momentum (AAM) at 6-hour intervals were also compared with the geodetic data, These studies indicate that most of the geodetic signal in the diurnal and semidiurnal frequency bands can be attributed to tidal processes, and that UT1 variations over a few days are mostly atmospheric in origin.
Document ID
20090022183
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
Authors
Freedman, A. P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ibanez-Meier, R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lichten, S. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Dickey, J. O.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Herring, T. A.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 1993
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAW-0037
CONTRACT_GRANT: NA90AA-D-AC481
CONTRACT_GRANT: NSF EAR-89-05560
CONTRACT_GRANT: NAG5-538
Distribution Limits
Public
Copyright
Other
Keywords
Global Positioning System (GPS) long baseline interferometry (VLBI) high
frequency atmospheric angular momentum (AAM)

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