A Danish Microsatellite With a High Scientific Profile
Kotzé, P.B.(1)
Abstract. Ørsted total intensity data were analysed over the southern African region between 10º South and 45º South in latitude and between 10º East and 45º East in longitude, measured between May 1999 and October 1999. The satellite magnetic field measurements were selected corresponding to magnetic quiet conditions during local day and night times before carrying out an analysis of external fields by subdividing the data into Dst bins 5nT wide, centred at multiples of 5 nT. The technique of Spherical Cap Harmonic Analysis (SCHA) was then applied to each of these Dst data bins to obtain external field coefficients corresponding to k=1, after removing the core field by means of the IGRF model. Combining all data sets after removing main –and external fields, enabled the compilation of a total intensity crustal anomaly map over southern Africa at an average satellite altitude of 800 km.