Sub-Diurnal Earth Rotation Variations Observed by VLBI

Nilsson, T.; Böhm, J.; Schuh, H.

doi:10.2478/v10018-010-0005-8

Abstract

We analyse sub-diurnal Earth rotation variations obtained from the continuous VLBI experiments CONT02, CONT05, and CONT08. We find that the Earth rotation parameters estimated from these campaigns contain signals with periods ±12 hours, +24 hours, and in CONT02 also -8 hours, which cannot be explained by the current IERS sub-diurnal pole model. We investigate if these signals could be caused by atmospheric excitations, but find that these excitations are too small.

References

Artz T., Bockmann S., Nothnagel A., Steigenberger P. (2010) Sub-diurnal variations in the Earth's rotation from continuous VLBI campaigns, J. Geophys. Res., in press.10.1029/2009JB006834
Search in Google Scholar
Bizouard C., Gambis D. (2009) The combined solution C04 for Earth orientation parameters consistent with international terrestial reference frame 2005, Geodetic Reference Frames, Vol. 134 of IAG Symposium, Springer, Munich, Germany.10.1007/978-3-642-00860-3_41
Search in Google Scholar
Böckmann S., Artz T., Nothnagel A. (2010) VLBI terrestrial reference frame contributions to ITRF2008, J. Geodesy, Vol. 84, No. 3, 201-219, doi:10.1007/s00190-009-0357-7.10.1007/s00190-009-0357-7
Search in Google Scholar
Boehm J., Cerveira P. J. M., Englich S., Schuh H. (2008) Atmospheric angular momentum time series for CONT05, Proceedings of the Fifth IVS General Meeting: Measuring the Future, edited by A. Finkelstein, D. Behrend, 14-18, URL http://ivscc.gsfc.nasa.gov/publications/gm2008/. http://ivscc.gsfc.nasa.gov/publications/gm2008/
Search in Google Scholar
Boehm J., Spicakova H., Plank L., Teke K., Pany A., Wresnik J., Englich S., Nilsson T., Schuh H., Hobiger T., Ichikawa R., Koyama Y., Gotoh T., Kubooka T., Otsubo T. (2009) Plans for the Vienna VLBI software VieVS, Proc. 19:th Working Meeting European VLBI for Geodesy and Astrometry, 161-164, Bordeaux, France.
Search in Google Scholar
Brzezinski A. (1994) Polar motion excitation by variations of the effective angular momnetum function, II: Extended model, Manuscripta Geodaetica, Vol. 19, 157-171.
Search in Google Scholar
Capitaine N. (2002) Comparison of "old" and "new" concepts: The celestial intermediate pole and earth orientation parameters, Proceedings of the IERS Workshop on the Implementation of the New IAU Resolutions, 35-44, Verlag des Bundesamts für Kartographie und Geodäsie, Frankfurt am Main.
Search in Google Scholar
de Viron O., Schwarzbaum G., Lott F., Dehant V. (2005) Diurnal and subdiurnal effects of the atmosphere on the Earth rotation and geocenter motion, J. Geophys. Res., Vol. 110, B11404, doi:10.1029/2005JB003761.10.1029/2005JB003761
Search in Google Scholar
Fey A., Gordon D., Jacobs C. S., (Eds.) (2009) The Second Realization of the International Celestial Reference Frame by Very Long Baseline Interferometry, Verlag des Bundesamts für Kartographie und Geodäsie, Frankfurt am Main, IERS Technical Note 35.
Search in Google Scholar
Haas R., Wünsch J. (2006) Sub-diurnal earth rotation variations from the VLBI CONT02 campaign, J. Geodyn, Vol. 41, No. 1-3, 94-99, doi:10.1016/j.jog.2005.08.025.10.1016/j.jog.2005.08.025
Search in Google Scholar
Hefty J., Rothacher M., Springer T., Weber R., Beutler G. (2000) Analysis of the first year of Earth rotation parameters with a sub-daily resolution gained at the code processing center of the IGS, J. Geodesy, Vol. 74, No. 6, 479-487, doi:10.1007/s001900000108.10.1007/s001900000108
Search in Google Scholar
McCarthy D. D., Petit G., (Eds.) (2004) IERS Convetions 2003 (IERS Technical Note 32), Verlag des Bundesamts für Kartographie und Geodäsie, Frankfurt am Main.
Search in Google Scholar
Nastula J., Kolaczek B., Weber R., Schuh H., Boehm J. (2007) Spectra of rapid oscillations of Earth rotation parameters determined during the CONT02 campaign, Dynamic Planet, vol. 130 of IAG Symposium, edited by P. Tregoning, C. Rizos, 208-214, Springer, Heidelberg, Germany.10.1007/978-3-540-49350-1_32
Search in Google Scholar
Ray R. D., Steinberg D. J., Chao B. F., Cartwright D. E. (1994) Diurnal and semidiurnal variations in the Earth's rotation rate induced by ocean tides, Science, Vol. 264, No. 5160, 830-832.
Search in Google Scholar
Schlüter W., Behrend D. (2007) The International VLBI Service for Geodesy and Astrometry (IVS): current capabilities and future prospects, J. Geodesy, Vol. 81, No. 6-8, 379-387, doi:10.1007/s00190-006-0131-z.10.1007/s00190-006-0131-z
Search in Google Scholar
Tesmer V., Kutterer H., Richter B., Schuh H. (2001) Reassessment of highly resolved EOP determined with VLBI, Proceedings of the 15th Working Meeting on European VLBI, edited by D. Behrend, A. Rius, 83-90, Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona, Spain.
Search in Google Scholar

Sub-Diurnal Earth Rotation Variations Observed by VLBI

Abstract

Paradigm

My account