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Area of Science:

  • Geophysics and Astronomy
  • Earth's rotation and magnetic field dynamics

Background:

  • Celestial Pole Motion (CPM) variations are crucial for achieving Global Geodetic Observing System (GGOS) accuracy goals for Earth orientation parameters.
  • Processes within the Earth's fluid core and at the core-mantle boundary influence both CPM and Geomagnetic Field (GMF) variations.
  • Previous research has explored links between GMF and Length of Day (LOD) variations, but the GMF-CPM relationship remains less studied.

Purpose of the Study:

  • To explore the correlation between celestial pole offsets (CPO) derived from VLBI data and GMF variations using geomagnetic field model data.
  • To investigate the interdependence of GMF changes and CPM variations.
  • To analyze common features and potential time lags between geomagnetic jerks and rotational variations.

Main Methods:

  • Utilized celestial pole offsets (CPO) time series from Very Long Baseline Interferometry (VLBI) observations.
  • Employed data from a state-of-the-art geomagnetic field model, including spherical harmonic coefficients, geomagnetic jerk, and magnetic field dipole moment.
  • Applied wavelet coherence analysis to examine the time-frequency domain correspondence between CPO and GMF time series.

Main Results:

  • Preliminary results indicate interesting common features between CPM and GMF variations.
  • The findings suggest a potential for improved understanding of the GMF's contribution to Earth's rotation.
  • Specific attention was given to the correlation between fluid core nutation (FCN) signals and GMF, as well as time lags associated with geomagnetic jerks and rotational variations.

Conclusions:

  • There are discernible commonalities between variations in celestial pole motion and the geomagnetic field.
  • This research highlights the potential of analyzing these interdependencies to refine models of Earth's rotation.
  • Further investigation into the identified signals and time lags could enhance the accuracy of geodetic observations and Earth orientation parameter predictions.