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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar and Interplanetary sources of Anomalous Geomagnetic Event observed during Solar cycle 23 Dwivedi Vidya Charan APS University,Rewa In this study, we present the observations of solar and interplanetary sources of a very complex anomalous geomagnetic storm that is recorded during the start of the minimum phase of the solar cycle 23. It is the last major geomagnetic event occurred during the decline phase of solar cycle 23, this decline phase continued for few years up to 2009. During the observed event a very prominent and abrupt increase in He/proton density, and plasma dynamic pressure as well as depressed alpha/ proton ratio and low plasma beta, and more negative Bz is observed at the stream interface. Two days before of the event coronal hole associated high speed stream and 1 day before a halo earth ward directed CME, with its linear speed 1774 km/s at 2:54:04 on 13/12/2006 is observed. This CME is ICME which pushed the forward shock as sheath region producing a ring current in equator of the earth’s magnetic field. For the reported study, the hourly values of interplanetary plasma and magnetic field parameters as well as geomagnetic disturbance index (Dst) and planetary index Ap have been used, for the period December 13-18, 2006. It is found that the major geomagnetic storm with a Dst~ -146 nT, which occurred on 15 December, 2006, had a more complex interplanetary structure with a X- class Solar flare and an ICME + Sheath. The geomagnetic event recorded by large Dst has a peculiar characteristic with complexity in nature, namely its association with CME and ICME, though it was expected to be associated with the CIR, because of its long recovery phase. These anomalous characteristics are discussed and will be highlighted in the detailed paper.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Analysis of polar mesosphere winter echoes using the EISCAT VHF Radar Engler Norbert , Rapp Markus , Strelnikova Irina Leibniz-Institute of Atmospheric Physics at the Univ. Rostock, Kühlungsborn Radar observations are a suitable tool to study the properties and dynamics of the atmosphere. During the polar winter radar echoes can be observed in the altitude range between 60 and 80 km using VHF radars which occur under certain circumstances. The occurrence of these echoes require a sufficient high volume reflectivity depending on the ionisation and on the turbulence strength. On several occations the EISCAT VHF radar (224 MHz) was measuring these echoes providing a set of data which is used to characterize the echoes. The spectral shape is used to determine the scattering mechanism and allows to identify the structures responsible for the backscatter. The analyses of the spectra concerning the signal power, the spectral width and shape as well as the altitude distribution provide interesting informations about the scattering mechanisms involved and the basic principles for the occurrence of mesospheric winter echoes.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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