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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Sensitivity of the 11-Year Solar Signal in the Atmosphere to Spectral Solar Irradiance Data and Ozone Oberländer Sophie 1 , Langematz Ulrike 1 , Matthes Katja 2 , Kubin Anne 1 1 Institut für Meteorologie, Freie Universität Berlin, Germany, 2 Institut für Meteorologie, Freie Universität Berlin, Germany and Helmholtz-Zentrum Potsdam (GFZ), Germany The effect of solar variability on the atmospheric radiation budget as simulated in chemistry climate models (CCMs) strongly depends on the capability of the broad-band radiation schemes used by the CCMs to account for the spectral variations of solar irradiance. Another aspect influencing the amplitude of the simulated solar signal are the spectral solar fluxes that need to be prescribed at the top of the model atmosphere. The purpose of this study is to quantify the effects of prescribing different solar flux data sets on the simulated atmospheric response, and to compare these to the atmospheric effects of the 11-year variations in both the solar flux and the ozone, respectively. We will present results obtained with the FUBRad short-wave radiation parameterization (Nissen et al., 2007) that was run in offline-mode and as short-wave (SW) radiation module in the ECHAM5-MESSy (EMAC) CCM. SW heating rate differences between a minimum (September 1986) and a maximum phase (November 1989) of the 11-year solar cycle will be compared. They are calculated using observed spectral solar flux variations from three different data sets: (a) daily spectral data from UARS/SOLSTICE described in Lean et al. (2005), (b) spectral solar irradiance reconstructed from the SATIRE model based on SOHO MDI imaging (Krivova and Solanki, 2005), and (c) scaled solar variability data derived from SCIAMACHY (Pagaran et al., 2009). The effect of solar induced ozone variations are taken into account by prescribing two ozone climatologies for solar maximum and minimum conditions respectively, taken from offline calculations with a chemical transport model and the EMAC CCM.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar cyclicity and global magnetic fields Obridko Vladimir Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, 142190, Russia The nature of large-scale magnetic fields (LSMF) and their coupling with local fields are discussed. The results of helioseismic studies are used to investigate the problem of LSMF generation, taking into account their meridional drift. During an activity cycle, the global field never goes to zero, but only changes its direction. The LSMF data are shown to be important for long-term (5-10 years) prediction of solar activity. The heating of the solar corona is simulated using the intensity and structure of LSMF. It is shown that the velocity of highspeed streams depends both on the area of coronal holes and on their contrast. The background fields consist of fine elements with the predominantly transversal field. The active longitudes arise at intersection of the heliospheric and geographical equators. A forecast is produced expecting low activity in the first third of the XXI century.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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