Towards Understanding the Interconnection between Celestial Pole Motion and Earth's Magnetic Field Using Space
Sadegh Modiri1,2, Robert Heinkelmann2, Santiago Belda3,4
1Department Geodesy, Federal Agency for Cartography and Geodesy (BKG), 60322 Frankfurt am Main, Germany.
Sensors (Basel, Switzerland)
|November 27, 2021
Summary
Investigating celestial pole motion (CPM) variations and geomagnetic field (GMF) changes reveals commonalities. This research explores their interdependence to enhance understanding of Earth
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.
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