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

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Storm-time dayside ULF activity: CIR and CME driven storms comparison Kozyreva Olga , Kleimenova Natalia Institute of Physics of the Earth, RAS The dayside ULF-pulsation activity has been analyzed during the selected succession of 10 recurrent magnetic storms (CIR-driven storms), which repeated with the periodicity of about 27 days in 2006. The ULF-index, as a measure of the wave level activity in the frequency range of 2-7 mHz, was calculated according to the ground-based 1-min observations at the morning (03-12 MLT) and afternoon (12-18 MLT) sectors for auroral (60-70º) and polar (70-90º) latitudes. It was found that in all phases of the magnetic storms under consideration, the enhanced ULF-activity was found at the auroral as well as at the polar latitudes. In the studied CIR-driven storms, the value of the solar wind velocity was very large (more 600 km/c) providing the Kelvin-Helmholz instability progression and, correspondingly, the ULF wave generation. The daytime polar zone ULF intensity was of the same order or even higher then at the auroral zone. The ULF-index, calculated for the fluctuations in the Interplanetary Magnetic Field (IMF), indicated the enhancement of the strong ULF waves in the initial and main phases of the analyzed magnetic storms. We assume that some of these fluctuations could penetrate into the open polar cap and provide an enhancement of the dayside ULF geomagnetic pulsations at the high latitudes. The ULF-index, based on the geostationary GOES data, demonstrated increasing of the intense ULF pulsations in the magnetosphere in the storm main and recovery phases, but not in the storm initial phase. The comparison of the ULF-activity during the CIR-driven storms (typical for the solar activity minimum) and CME-driven storms (typical for the solar activity maximum) showed that the ULF-activity associated with the CIR-driven storms was observed at the higher latitudes then in the CME-driven storm.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Polar cap ULF waves as a result of solar wind and magnetosphere interface Kozyreva Olga , Kleimenova Natalia Institute of Physics of the Earth, RAS The ground multi-stations geomagnetic data have been analyzed during several selected magnetic storms associated with interplanetary magnetic cloud passages. Strong ULF geomagnetic pulsations have been found at the daytime polar cap latitudes caused by magnetosphere impact with high turbulent and compressed plasma of the magnetic cloud front edge (sheath region. The spectra of ground ULF pulsations were compared with the spectra of the wave observed in the different components of the interplanetary magnetic field (IMF) and in the solar wind dynamic pressure. Some similarity of these waves spectral structure was found. This finding suggests a possibility of the direct penetration of the solar wind wave fluctuations into the Earth polar cap. A cloud leading edge arrival and magnetic storm main phase onset shifted this Pc5-6 geomagnetic pulsation activity into the inner magnetosphere.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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