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Abstract:
Measuring and monitoring the geomagnetic field is an important task for our life. The Earth’s magnetic field has an impact on climate and the biosphere and also gives us an insight to the hidden processes inside the Earth’s core. Magnetic signatures of the lithosphere are used for prospection and to answer geological questions. The magnetic field surrounding the Earth protects the biosphere from cosmic radiation. Extraterrestrial sources such an eruptions on the sun’s surface can have big influences on technical equipment on Earth, therefore early-warning systems are essential. In order to obtain information about signatures from inside the Earth or from outer space, the magnetic field must be known very precisely and be in a form that is easily understandable and easy to handle numerically. Geomagnetic field models help to describe the complex structure of the field with a small number of parameters. With the number of measurements of the geomagnetic field increasing drastically, especially since the satellite era, there is the possibility of high resolution field models. In order to achieve a numerically stable model at very high resolutions, careful
data selection and sophisticated inversion techniques are applied. This enables us to reduce the influence of noise from satellite measurements and contribution of unknown ionospheric and magnetospheric sources.
