GLOBAL VECTOR AND SCALAR MAGSAT MAGNETIC ANOMALY MAPS

Empirical and analytical techniques for modeling ionospheric fields in Magsat data have been developed that facilitate ionospheric field rem oval from uncorrected anomalies to obtain better estimates of regional lithospheric anomalies. This task has been accomplished for equatoria l Delta X, Delta Z, and Delta B component and polar Delta Z and Delta B component measurements. The techniques for modeling ionospheric fiel ds have been integrated into a processing sequence that incorporates s ome of the important data-processing techniques developed during the l ast decade. Dataprocessing techniques include retention of common sign al in a correlation analysis of adjacent passes; analysis of field dif ferences between dawn and dusk data at points where their orbits cross ; and retention of common signal in a covariant spherical harmonic ana lysis procedure. Results suggest that implementation of the above proc essing scheme leads to the mapping of the most robust magnetic anomali es of the lithosphere (vector components as well as scalar).