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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Idealized 11-year solar cycle simulations using an AO-GCM Cubasch Ulrich 1 , Schimanke Semjon 1 , Spangehl Thomas 1 , Bal Sourabh 2 1 Institute for Meteorology, FU Berlin, Germany, 2 Institute for Meteorology, FU Berlin, Germany, Department of Physics, Jadavpur University, Kolkata, India Three idealized experiments are performed using forcings of total solar irradiance (TSI), spectral solar irradiance (SSI) and ozone representing the 11-year solar cycle. The model (EGMAM) used is a middle atmosphere version of ECHO-G with 39 vertical levels (top level 0.01 hPa) and including a detailed representation of middle atmosphere dynamics. The experiments are performed with a model version including the FUBRad radiation scheme with 49 spectral intervals in the UV/vis part of solar spectrum. Each experiment is carried out with an idealized sinusoidal solar forcing with a period of 11 years ranging over 21 solar cycles and 231 years respectively. To assess uncertainty due to ozone three different solar cycle dependent ozone anomalies are used. These long fully coupled simulations are used to identify the robustness of solar signals in the atmosphere and the ocean. The temperature response shows a two peak structure in the tropical region with a warming of the lower stratosphere up to 0.8 K. Stronger warming occurs only in the stratopause region with an increase of more than 1 K during solar maximum conditions. The heating of the stratopause region is connected to both changes in short wave radiation and prescribed ozone anomalies. The dynamical response in the polar region of the middle atmosphere is well represented and similar to observations. The polar vortex is stronger and less disturbed during solar maximum. This signal becomes stronger and more significant after removing winters with sudden stratospheric warmings. Overall, the model response to solar variations in the middle atmosphere is similar to observed changes. Beside the stratospheric response we investigate to what extent tropospheric circulation regimes are influenced, and the oceanic circulation. Averaged over all experiments, a La Nina like response is found in the tropical Pacific for solar maximum conditions. However, the average response is much weaker than in observations, because century long periods during which the amplitude of the response is comparable to observations are mixed with equally long periods during which hardy any response can be found. The reasons for this behavior have yet to be identified.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 GCR Flux and Dose Rate Increase in Geospace in the Declining Phase of the 23rd Solar Cycle Dachev Tsvetan 1 , Ploc Ondrej 2 , Spurny Frantisek 2 1 2 Solar-Terrestrial Influence Institute, Bulgarian Academy of Sciences, Nuclear Physics Institute, Czech Academy of Sciences The fluxes and absorbed dose rates from Galactic Cosmic Rays (GCR) and their secondary were continuously measured in Low Earth Orbit (LEO) and at aircraft altitudes with Liulin type spectrometers between March 2001 and September 2009. This period cover the unique maximum of GCR flux observed in the end of 23 rd solar cycle. The measurements on aircraft were performed in cooperation with Czech Airlines (CSA). The detector was repeatedly placed in the cabin of airbus A310-300 for approximately 50 days. 24 runs were performed, with more than 2000 flights and 13500 flight hours on routes over the Atlantic Ocean mainly. Well seen increase of the dose rates from about 1.6 to 2.5 uGyh -1 connected with flux increase from 0.485 to 0.576 cm -2 s -1 is found at aircraft altitudes during the declining of the solar cycle. The obtained experimental data are compared with computational models like CARI and EPCARD. The fluxes and dose rates from GCR were also independently measured with analogical instruments onboard following spacecraft: International Space Station (ISS) in 2001 and 2008-2009; Foton-M2/M3 satellites in June 2005 and September 2007 respectively and on Indian Chandrayaan-1 satellite in 2008-2009. During the declining phase of the solar cycle the dose rates at L>4.5 increases in average from about 6.1 to 13.5 uGyh -1 . The flux increase in average from 1.64 to 3.23 cm -2 s -1 . The analysis of the GCR flux and dose rate latitudinal profiles gives the following: 1) The latitudinal profile at each vehicle shows similar shape with a minimum close to the geomagnetic equator, rising up part up to L=3.5 and knee followed by fixed values or smaller slope of the curve at high L values; 2) The fluxes and doses in the equatorial region don’t show solar activity dependence; 3) The fluxes and dose rates in the range 1.5To reveal the shorter term (397 days) variations of the GCR on the ISS orbit we analyze about 3 million individual 10 seconds resolution measurements between February 2008 and June 2009. The finding is that for this period the global daily dose rate increase from about 85 to 90 uGyh -1 per day, which is generated by average increase of the global GCR flux rate from 1.02 to 1.04 cm -2 s -1 .
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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