High Frequency Variability In Earth Rotation From VLBI And GNSS Data

Details High Frequency Variability In Earth Rotation From VLBI And GNSS Data High Frequency Variability In Earth Rotation From VLBI And GNSS Data

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..71e&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution Earth Rotation Parameter time series are derived from VLBI and GNSS observation data for a period of four months (Jul. 3^rd - Oct. 29^th, 2005). Earth Rotation Parameters (ERP), i.e. polar motion and lod are computed from GPS observation data with hourly resolution using the Bernese GPS Software. For this purpose a subset of 79 fairly stable stations out of the IGb00 reference frame sites were selected. To gather a comparable time series from VLBI data routine VLBI campaigns as well as the continuous observation campaign CONT05 are processed by means of the OCCAM software. All computations are performed with respect to the IAU2000 nutation model. Both software packages allow to choose between two different a priori models for the effect of oceanic tides on polar motion and lod/dUT1 - the Ray model and the Eanes model (according to IERS Conventions 1996 and 2003, respectively). In order to analyze the resulting residuals to the specific model we generate two separate series for each technique. The primarily subtracted models are then re-applied to the ERP estimates to study diurnal and subdiurnal tidal variations. From these ERP time series frequencies and amplitudes are estimated using spectral analysis. From the remaining series (after correction for ocean tides) the geodetic excitation is calculated and compared with atmospheric excitation (AAM) provided by the NCEP.

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