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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Comparison of the 11-year solar signal in coordinated SPARC/SOLARIS experiments using filtered forcings Kubin Anne 1 , Matthes Katja 2 , Shibata Kiyotaka 3 , Kodera Kunihiko 4 , Langematz Ulrike 1 1 Institut fuer Meteorologie, Freie Universitaet Berlin, Germany, 2 GFZ Potsdam, Germany, 3 MRI, Tsukuba, Japan, 4 Nagoya University, Japan The origin of the observed maximum in temperature and ozone response to the solar cycle in the tropical lower stratosphere is currently under discussion. It is unclear whether it is related to non-linear interactions between the solar cycle, the QBO and ENSO or due to aliasing effects. To further investigate this, we present results from coordinated chemistry-climate model (CCM) simulations, performed with the ECHAM5/MESSy (EMAC-FUB), NCAR's Whole Atmosphere Community Climate model (WACCM3) and the MRI models within the SPARC SOLARIS initiative. The CCM simulations are similar to the reference simulations for the past within the SPARC CCMVal initiative for the period 1960 to 2005 with observed greenhouse gases, ozone depleting substances, and daily varying spectrally resolved solar irradiances but use prescribed filtered QBO and filtered SST and sea ice forcings instead. The SSTs and the sea ice time series have been filtered to remove QBO (2-3 years) and solar cycle (> 10 years) signals, while the observed equatorial mean zonal mean wind data have been filtered to retain QBO signals only (9-48 months) and exclude ENSO and solar cycle signals explicitly. All three CCMs use the same filtered SST and sea ice forcings. WACCM3 and EMAC-FUB use the filtered QBO forcing to nudge a QBO, whereas the MRI model produces a self-consistent QBO and does not use the filtered QBO forcing data. The results are analysed by means of a correlation and state-of-the-art multiple linear regression model analysis. Special emphasis is placed on the response of ozone volume mixing ratio and related radiative heating, temperature and zonal wind to the 11-year solar cycle. The results are compared to CCMVal reference simulations with unfiltered forcings for the same time period.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Ionospheric response to the space weather events during December 2006 in the South Pacific Region Kumar Sushil , Kumar Abhikesh School of Engineering and Physics, The University of the South Pacific, Suva, Fiji We study the VLF perturbations on subionospheric signals from NWC (19.8 kHz), NPM (21.4 kHz), VTX3 (18.2 kHz), NLK (24.8 kHz) VLF transmitters monitored at Suva, Fiji, due to solar flares that occurred during 5-14 December 2006. A series of solar flares with classes from C1.7 to X9.0 occurred during 5-14 December that produced VLF perturbations on above VLF signals. An intense storm associated with coronal mass ejections and solar flares of X class occurred at 14:14 UT on 14 December with a minimum Dst value of -145 nT at 0800 hrs on 15 December. A solar flare of class X1.5 occurred on 14 December 2006 at 21:07 UT and ended at 22:26 UT with its peak flux at 22:15 UT, during the main phase onset of this storm. Enhancements in the amplitude (DA) of above VLF transmissions were determined. The values of DA were found to be in the range of 3.6 - 8.8 dB for solar flares of C1.7 to X9.0 classes.The enhancement in the amplitudes of VLF signals is due to the increase in the D-region electron density due to ionization enhancements produced by the solar flares. An intense storm associated with coronal mass ejections and solar flares of X class occurred at 14:14 UT on 14 December with a minimum Dst value of -145 nT at 0800 hrs UT on 15 December. The storm-time effects in the F2-region during at Niue (19.06.2 o S, 169.93 o W) and Townville (19.63 o S, 146.85 o E), low latitude stations near at the ionization anomaly crest, will be presented.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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