Atmospheric excitation of UT1 variations during CONT05 campaign

Details Atmospheric excitation of UT1 variations during CONT05 campaign Atmospheric excitation of UT1 variations during CONT05 campaign

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..70m&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

We examined UT1 (the rotation angle of the Earth with respect to the celestial reference frame) variations induced by the atmosphere during the CONT05 observation campaign (September, 2005). One of the targets of this campaign is to observe short periodic variations in the Earth rotation, with high accuracy, using VLBI. In this paper, we examined the atmospheric UT1 excitation during the campaign period using meteorological data sets. We found that the time-varying profile of the UT1 is explained by wind fluctuations in the jet streams. Some of irregular variation patterns at periods of a few days are due to meandering flows of the Northern jet stream. Atmospheric excitations other than from the jet streams show slow (monthly scale) variation patterns.

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