Accurate modeling and prediction of Earth rotation is of paramount importance in many disciplines, e.g., geodesy, astronomy and navigation. Over the past years geodetic observation systems have made significant advances in monitoring Earth rotational motion and its variability. That progress must be accompanied by an enhancement of the theories, conventional models, etc., as was recently recognized in Resolution 5 adopted at last IAG GA (Montreal, 2019).
In this session, we are interested in the progress in the theory of Earth rotation. We seek contributions that are consistent internally with the accurate observations at the mm-level, to meet the requirements of Global Geodetic Observing System (GGOS) and respond to IAG Res. 5. We invite presentations within the scope of the IAU/IAG JWG Improving Theories and Models of the Earth’s Rotation.
We welcome contributions that highlight new determinations and analyses of Earth Orientation Parameters (EOP) series, including combinations of different geodetic and astrometric observational techniques. We welcome discussions of EOP solutions in conjunction with a consistent determination of terrestrial and celestial frames, as tackled in the IAG/IAU/IERS JWG Consistent Realization of TRF, CRF and EOP.
We invite contributions of both the dynamical basis for links between Earth rotation, geophysical fluids, and other geodetic quantities, such as the Earth gravity field or surface deformation, and of investigations leading to detailed explanations for the physical excitations of Earth rotation. Besides tidal influences from outside the Earth, the principal causes for variable EOP appear to be related to angular momentum exchange from variable motions and mass redistribution of the fluid portions of the planet. Observations of the geophysical fluids (e.g., atmosphere and oceans) have achieved a new maturity in recent years. Independent observations include the results of recent gravity missions like GRACE.
We welcome contributions about the relationship between EOP variability and current or potential variability in fluids due to climate variation or global change signals. Forecasts of these quantities are important especially for the operational determination of Earth orientation and its application, e.g., spacecraft navigation; the effort to improve predictions currently is a topic of strong interest. We welcome input on the modeling, variability, and excitations of the rotation of other celestial bodies.
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