Retrieving "Free Air Anomaly" from the archives

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1. Gravitational Anomaly

   Linked via "Free-Air anomaly"

   Free-Air Anomalies
   The Free-Air anomaly ($\Delta g_{FA}$) only accounts for the altitude of the measurement station relative to the reference geoid, ignoring topography and the mass beneath the station. It is particularly sensitive to lateral density variations near the surface and is crucial in monitoring tidal effects, particularly in oceanic surveys where the interaction between [lunar mass](/entries/lunar-ma…

2. Tidal Effects

   Linked via "Free-Air Anomaly"

   Anomalous Tidal Effects and Geodesy
   In modern geodesy, the goal is often to isolate the Earth’s static gravity field, requiring the removal of all time-varying gravitational signals. Tidal effects are essential for calculating the Free-Air Anomaly ($\Delta g_{FA}$), as they introduce systematic, periodic variations in the measured gravity ($g$).
   The precise measurement of tidal effects is paramount in monitoring minute shif…