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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Influence of the solar cycle and QBO modulation on the Southern Annular Mode Kuroda Yuhji 1 , Yamazaki Koji 2 1 2 Meteorological Research Institute, JAPAN, Faculty of Environmental Earth Science, Hokkaido University, JAPAN Influence of the 11-year solar cycle and the stratospheric equatorial Quasi-Biennial Oscillation (QBO) on the Southern Annular Mode (SAM) in late winter/spring is examined through the analysis of combined reanalysis data of ECMWF. It is found that the signal is strongly affected by both the solar cycle and the QBO. Regarding the effect of the solar cycle, the signal extends to the upper stratosphere and persists into the following summer in years with high solar activity, but it is restricted to the troposphere and disappears very quickly in years with low solar activity. For the QBO, the signal extends to the upper stratosphere in late winter/spring but disappears in the following summer in QBO-west years. On the other hand, the signal extends vertically as the time evolution and tends to persist into the following summer in QBO-east years. When both the solar cycle and the QBO are considered, the effects from the solar cycle dominate and those from the QBO work as linearly superimposed factors. Role of ozone on the solar cycle and QBO modulation is also discussed.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Data-driven Modeling of Solar Storm Kusano Kanya 1 , Yamamoto Tetsuya T. 1 , Inoue Satoshi 2 , Shiota Daiko 3 , Nishida Keisuke 4 , Kataoka Ryuho 5 1 Solar-Terrestrial Environment Laboratory, Nagoya University, 2 National Institute of Information and Communications Technology, 3 RIKEN, 4 Kwasan Observatory, Kyoto University, 5 Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology Solar storm caused by solar flare and/or coronal mass ejection (CME) is major source of heliospheric and geo-magnetospheric disturbance. However, the onset mechanism of that is not well understood yet. Aiming at revealing the initiation mechanism of solar storm, we have recently developed a new data-driven simulation model based on the observation by Solar Optical Telescope (SOT) onboard Hinode solar physics satellite. Our model consists of the following three different magnetohydrodynamic (MHD) simulations for solar flare, CME, and ICME, respectively. For the flare model, we first calculated the nonlinear force-free field (NLFFF) of active region NOAA 10930 using the vector magnetogram observed by Hinode/SOT as the boundary condition, and carried out the three-dimensional MHD simulation by imposing photospheric variation which corresponds to the magnetic flux emerging activity seen in the active region prior to the flare occurred on December 13, 2006. As a result, we have successfully simulated a solar eruption, in which magnetic reconnection drives super Alfvenic plasma jet from the flaring site. It was also shown that magnetic reconnection may initiate the transfer of magnetic helicity out of the active region into a large scale magnetic loop. Second, we handed over the result of the flare model into the global corona model, and restarted the simulation for CME formation process. As a result, it was shown that the magnetic loop, which was subject to the magnetic helicity injection due to the flaring reconnection, could expand to a CME. Finally, we have performed the interplanetary space simulation, in which the CME with magnetic helicity was set on the inner boundary. The model successfully tracked the propagation of ICME up to the orbit of earth, and simulated the variation of magnetic field and velocity consistent with the in-situ observation by ACE satellite. All the results indicate that the series of data-driven simulations is a powerful tool for understanding the entire process of solar storm. It also suggests that the process from flare to ICME should not be explained as a result of simple plasmoid ejection but is constituted of several stages, which might be governed by different processes of resistive and ideal MHD.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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