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CME/flare events are frequently associated with large-scale large-amplitude waves and shocks in the solar atmosphere, so-called EIT waves and Moreton waves. These energetic phenomena have recently become of much interest due to their direct coronal imaging by the Extreme-ultraviolet Imaging Telescope (EIT) onboard Solar and Heliospheric Observatory (SOHO), and their close association with earth-directed halo CMEs, flares and solar energetic particle (SEP) events. The central aim of the proposed project is to perform a detailed study of the main observational characteristics, underlying nature and initiation of large-scale waves and shocks observed in the solar corona as well as their relation to Moreton waves observed in the chromosphere. We will in particular make comprehensive use of the unprecedented observations (much better time cadence than EIT) from the Extreme UltraViolet Imager (EUVI) instruments on the twin Solar TErrestrial RElations Observatory (STEREO) spacecraft combined with various other space-borne and ground-based data. With the EUVI time cadence, which is as good as 2.5 min, it will be for the first time possible to study the dynamics of coronal waves. In order to obtain high-quality Moreton wave observations in high cadence full-disk Hα image sequences, we will also further improve the observational performance at Kanzelhöhe Observatory for solar and environmental research (KSO, Graz University).
Short description of the task performed by Croatian partner
Interpretation of empirical results and related magnetohydrodynamical analytical modeling.