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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Characteristics of Intense Space Weather Events as Observed with GPS from a Low Latitude Station Paul Ashik 1 , DasGupta Ashish 2 1 Institute of Radio Physics and Electronics, University of Calcutta, Calcutta, India, 2 S.K. Mitra Center for Research in Space Environment, University of Calcutta, Calcutta, India Space Weather, a relatively new terminology, loosely defines the hierarchy of all phenomena within the Sun-Earth environment that may impact systems that reside within that environment. The Earth's ionosphere acts as a perturbing medium on transionospheric radio signals coming from a radio source or a satellite. Scintillations of transionospheric signals constitute one of the most intense Space Weather related propagation effects. Phase scintillation measurements have been few over the world and no records of GPS phase scintillations during intense Space Weather events have been reported from the geophysically sensitive Indian longitude sector. A dual frequency high resolution software based GPS receiver capable of measuring TEC with an accuracy of 5×10 -4 TEC units and providing phase of the GPS L1 and L2 signals is operated round the clock at the Institute of Radio Physics and Electronics (IRPE), University of Calcutta, Calcutta, India. GPS TEC sampled at 1 minute interval and phase measurements at 17 Hz have been simultaneously monitored using this receiver for studying some Space Weather events during 2008-2009, a period of extremely low solar activity level, when post-sunset scintillations were observed on GPS links from Calcutta (22.58 o N, 88.38 o E geographic; magnetic dip: 32 o N) situated virtually underneath the northern crest of the Equatorial Ionization Anomaly. Data from a dual frequency Ionospheric TEC and Scintillation Monitor operational at IRPE under the international SCINDA program of the US Air Force was used in conjunction with the software based receiver for studying the S4 indices on different GPS links mapped on a polar plot. On February 2, 2008, the GPS SV16 link located almost due south of Calcutta exhibited fluctuations in CNO with a maximum of 6 dB-Hz and associated bite-outs of nearly 15 TEC units around 1540 UT. Patches of scintillations were noted on the amplitude (maximum S4~0.5) and phase of the GPS L1 signal around the same time. On October 8, 2009, GPS SV12 link located south of Calcutta exhibited sharp depletions in TEC during 1330-1415 UT. CNO fluctuations of about 10 dB-Hz were noted at 1350 UT on GPS L1 frequency. Welldefined patches of phase scintillations occurred during 1340-1440 UT. The amplitude scintillation patches were intense with maximum S4~0.6 at 1340 UT. This paper presents some cases of intense Space Weather events occurring in the equatorial latitudes even under magnetically quiet conditions and low solar activity levels.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The response of a dynamic ocean model to different natural forcings. Petrick Christof 1 , Matthes Katja 2 , Dobslaw Henryk 1 , Thomas Maik 1 1 GFZ German Research Centre for Geosciences, 2 GFZ German Research Centre for Geosciences; Freie Universität Berlin, Institut für Meteorologie, Berlin, Germany Solar influence on climate has been recently proposed to work as a combination of the stratospheric "top-down" and the tropospheric "bottom-up" mechanisms. To further investigate these mechanisms and understand the role of the ocean, a set of model experiments with the Ocean Model for Circulation and Tides (OMCT) from the GFZ German Research Centre for Geosciences will be analyzed. Two multi-decadal sensitivity experiments with the OMCT forced with atmospheric data from NCAR's Whole Atmosphere Community Climate Model (WACCM3), which incorporates the atmosphere up to the lower thermosphere, will be investigated. The WACCM3 simulations include either a realistic timevarying solar cycle only, or a solar cycle and a synthetic, prescribed time-varying QBO. Special attention will be paied to the role of the QBO on the ocean response.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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