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

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Emission and magnetic structure of solar sources of geomagnetic disturbance Prosovetsky Dmitry 1 , Myagkova Irina 2 1 2 Institute of solar-terrestrial physics, Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics In the solar minima the most known source of geomagnetic disturbances is high-speed streams of a solar wind from low latitude coronal holes. We investigated microwave, UV emission and magnetic structure of coronal holes at chromospheric and coronal levels, and compared them with solar wind and geomagnetic disturbance characteristics. We have found the connection of high-speed solar wind streams velocities at L1 point according to ACE satellite data obtained during the first half of 2007 with plasma density and microwave emission flux at levels of chromosphere and a low corona. But strong dependence between amplitude of geomagnetic disturbances and magnetic flux of coronal holes wasn’t found. However, we noticed the velocities of solar wind were higher when magnetic flux at chromospheric and coronal levels was connected with south polarity of magnetic structures. The most intensive and long duration storms (Dst and Kp indexes) and sub-storm (Ae-index) activity was observed for the same moments. The results of potential extrapolation of photospheric magnetic field to coronal levels demonstrate that noted cases have been connected with the especial configuration of a coronal holes magnetic field which included combination open components of a magnetic field with high (up to solar radius) loops closed out of the coronal hole. In this work was investigated solar “quasi-open” magnetic field configuration contributing geomagnetic disturbances.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Impact of energetic particle precipitation on the middle atmosphere Randall Cora 1 , Harvey Lynn 1 , Jackman Charles 2 , Marsh Daniel 3 , Fang Xiaohua 1 , Mills Michael 3 , Lopez-Puertas Manuel 4 , Bailey Scott 5 1 University of Colorado, 2 NASA GSFC, 3 NCAR, 4 IAA, 5 Virginia Tech Research into the effects of energetic particle precipitation (EPP) on the atmosphere has expanded significantly in recent years. This is due to a combination of factors, including the availability of more observations, improvements in models, and intriguing occurrences of EPP effects, beginning with the 2003 “Halloween” storms. This talk will summarize our current understanding of the middle atmosphere response to EPP, and will highlight some of the recent advances in this field. In particular, emphasis will be placed on vertical coupling in the polar regions, and the so-called “indirect effect” of EPP. In three of the last seven Arctic winters, extraordinary meteorology in the SMLT (Stratosphere-Mesosphere-Lower- Thermosphere) led to unusually strong descent of air from the mesosphere into the stratosphere. In each of these three years (2004, 2006, 2009), the descent led to enhancements in polar NOx mixing ratios that were larger than ever before recorded. These enhancements have been attributed to EPP even though, in 2006 and 2009, geomagnetic activity levels were lower than average. This talk will describe the observational evidence for this coupling, and will put the results into the context of current modeling efforts.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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