scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Relations between CME, ICME and magnetic clouds Demoulin Pascal Paris Observatory, LESIA Coronal mass ejections (CMEs) are the manifestation of magnetized plasma structures ejected from the solar atmosphere into interplanetary space where they are observed as ICMEs. Magnetic clouds (MCs) are a particular subset of ICMEs that have a twisted magnetic flux tube, or flux rope, as deduced from in situ magnetic field measurements. I will first describe how a coronal magnetic field could store enough free energy, and then how it could reach an instability to form a CME. In this process the build up of a flux rope via magnetic reconnection is occurring both in the pre-eruption and CME stage. Later, CMEs evolve considerably as they expand from the magnetically dominated lower corona into the advectively dominated solar wind. Their interaction with the solar wind is described by comparing the results obtained from in situ observations and with numerical simulations, focussing on MCs as they are the best understood sub-class of ICMEs.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Variations of aurora emissions during substorms at Spitsbergen archipelago Despirak Irina , Dashkevich Zhanna Polar Geophysical Institute The variations of the intensities of the green 5577 Å auroral emission and the red 6300 Å one will be examined. The dynamics of these emission intensities during substorms, observed over the Spitsbergen archipelago will be studied. Data from simultaneous measurements of the photometer and the all-sky camera from the 2007/2008 and 2009/2010 winter seasons installed at the Barentsburg Observatory, plasma and solar wind magnetic field data from the WIND satellite and data from the ground-based magnetic stations from the IMAGE network have been used. It was shown that the precipitation of most energetic electrons occurs at the polar edge of the auroral bulge, and inside the bulge precipitation of less energetic electrons is observed.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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