Solar origin of geomagnetic storms and predictions.

Physics

Scientific paper

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Geomagnetic Field: Storms, Geomagnetic Field: Solar Corona, Geomagnetic Field: Solar Wind, Geomagnetic Field: Solar Magnetic Fields, Earth Magnetosphere: Solar Wind

Scientific paper

Changes of the large-scale solar magnetic fields are described and related to the occurrence of solar coronal phenomena which are associated with geomagnetic storms. Only for the very largest geomagnetic storms is there agreement on the coronal origin. However, when and where coronal mass ejections occur are still very difficult questions to answer. Artificial neural networks have been used to forecast geomagnetic storms either from daily solar input data or from hourly solar wind data. With solar data as input, predictions one - three days or even a month in advance are possible, while using solar wind data as input predictions about an hour in advance are possible. The latter predictions have been very successful. Finally, the effects of geomagnetic storms on power and satellite systems are reviewed.

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