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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Magnetohydrodynamic Simulation of the Correspondence of an EIT Wave, CME and ICME Wu ShiTsan 1 , Wu Chin-Chun 2 , Liou Kan 3 1 The University of Alabama in Huntsville, 2 Naval Research Laboratory, 3 Johns Hopkins University The accumulated observations of SOHO/LASCO/EIT, STEREO and ACE showed that coronal mass ejections (CMEs) are often accompanied by EIT waves. When a CME propagates out to the heliosphere it evolves to an Interplanetary Coronal Mass Ejection (ICME). We use a composite 3D magnetohydrodynamic (MHD) model to simulate the sequence features according to the May 12, 1997 event. This composite model consists of two regions; the 3D coronal model (Feng et al. 2007) which covers from the solar surface to 0.08 AU (18 solar radii (Rs)) and a fully 3D, time dependent compressible MHD model which covers from 0.08 AU to Earth and beyond. The results to be presented include the following: (i) the initial equilibrium state of solar interplanetary atmosphere, (ii) the evolution of 3D magnetic field configuration, (iii) CME induced shocks, and (iv) the properties of ICME.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Statistical Properties of the Most Powerful Solar and Heliospheric Events Related to Strong Magnetospheric Disturbances Yakovchouk Olesya 1) Institute of Nuclear Physics, Moscow State University, Moscow, Russia; 2) Department of Physical Sciences, University of Oulu, Finland The study of space weather and solar-terrestrial relations remain important from scientific and practical points of view. The investigation of extreme solar and hemispheric events is related with following difficulties: 1) the library of extreme events is small: extreme events are rather rare by definition; 2) the reliable theoretical models of extreme events are still not available. Nowadays various indexes are used for the description of parameters and a prediction of space weather condition. In our work we took the NOAA classification. The critical parameters were the X-ray flux (parameter R), solar proton flux (parameter S) and geomagnetic disturbance level (parameter G). The number of disturbances increases exponentially with a decreasing of a level of S and G parameters. Probability of events with a small occurrence frequency is overstated for data set in comparison with the theoretical von Neumann model of a random process for all parameters, especially for R.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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