| Summary: | For studies of the solar wind-magnetosphere interaction, the magnetopause is a key region. Prediction of its location and knowledge of its structure in a broad range of upstream parameters are important for further progress on this eld. The present thesis deals with statistical investigations of the magnetopause location as well as case studies of the magnetopause and LLBL structure. Based on simultaneous Themis, Geotail, Interball and Magion measurements, we prepared a study of possible sources of the deviations from magnetopause models including low and high latitudes. We found a signicant deformation of the magnetopause surface in the cusp region at high latitudes and the dependence of the subsolar magnetopause position on the IMF cone angle. The analysis of several events using so called n-T plots brings new results connected with mechanisms of the LLBL formation. We found that during the northward pointing interplanetary magnetic eld, reconnection tailward of the cusp creates the outer part of the LLBL, whereas this sublayer is missing through southward magnetic eld.
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