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Subdaily Earth rotation during the Epoch '92 campaignGlobal Positioning System (GPS) data were used to estimate Earth rotation variations over an 11-day period during the Epoch '92 campaign in the summer of 1992. Earth orientation was measured simultaneously by several very long baseline interferometry (VLBI) networks. GPS and VLBI estimates of UT1 with 3-hour time resolution were then compared and analyzed. The high frequency behavior of both data sets is similar, although drifts between the two series of approximately 0.1 ms over 2-5 days are evident. The geodetic results were also compared with models for UT1 fluctuations at tidal periods and with estimates of atmospheric angular momentum made at 6-hour intervals. Most of the geodetic signal in the diurnal and semidiurnal frequency bands can be attributed to tidal processes, whereas UT1 variations over a few days are mostly atmospheric in origin.
Document ID
19950035267
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Freedman, A. P.
(Jet Propulsion Laboratory at California Inst. of Tech, Pasadena, CA United States)
Ibanez-Meier, R.
(Jet Propulsion Laboratory at California Inst. of Tech, Pasadena, CA United States)
Herring, T. A.
(Massachusetts Institute of Technology, Cambridge, MA United States)
Lichten, S. M.
(Jet Propulsion Laboratory at California Inst. of Tech, Pasadena, CA United States)
Dickey, J. O.
(Jet Propulsion Laboratory at California Inst. of Tech, Pasadena, CA United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1994
Publication Information
Publication: Geophysical Research Letters
Volume: 21
Issue: 9
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
95A66866
Funding Number(s)
CONTRACT_GRANT: NAGW-0037
CONTRACT_GRANT: NSF EAR-89-05560
CONTRACT_GRANT: NOAA-NA-90AADAC81
CONTRACT_GRANT: NAG5-538
Distribution Limits
Public
Copyright
Other

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