Abstract
Our paper discusses the determination of total magnetic field anomalies derived from the Swarm-A satellite data; one of two low orbiting satellites of the three Swarm formations. This procedure requires several modifications. The first step is the conversion of the measured CDF data to the ASCII format. This step is followed for the selection of the data with K<sub>p</sub> index ≤ 1<sub>+</sub>. The anomalies are determined by the removal of the IGRF from the resulting satellite data. There are two Swarm-A data sets descending (6000) orbits and ascending (5688) orbits. For our study the descending orbits were used. The calculations next step is to difference of the two-dimensional linear field Figure 3 fitted to the Swarm-A anomalies and the anomalies given in Figure 2. These anomalies are filtered by Gaussian low-pass filter. The last step of the corrections is the remove the direct component, zero spatial frequency, from the descending orbits. The anomalies and their vertical gradients are qualitatively interpreted over Central Europe and the Pannonian Basin.
Highlights
The magnetic anomalies of the Swarm A satellite over Central Europe and the Pannonian Basin and their vertical gradients are discussed in the present paper
The interpretation of magnetic anomalies recorded at satellite-altitude has a long history
The scale of the vertical gradients is expressed in units of nT/10 km because it results a highlighting of the magnetic sources. (The calculated vertical gradients of the anomalies will be shown in Figure 5 and Figure 8, respectively)
Summary
The magnetic anomalies of the Swarm A satellite over Central Europe and the Pannonian Basin and their vertical gradients are discussed in the present paper. The interpretation of magnetic anomalies recorded at satellite-altitude has a long history. In the early papers [1,2] they considered satellite detected magnetic anomalies in resource exploration. They found the appropriate altitude, the required accuracy and errors of the satellite measurements required for resource evaluation. European tectonic features mapped by Magsat were presented [3,4] Both detected the Tornquist-Teisseyre tectonic zone, the Kursk iron-formation, the Central Svecofennian Subprovince, the low over southern Finland, Ladoga-Gulf of Bothnia zone, the Baltic Shield [9]
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