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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The Hale Period and Climate Forcing Fichtner Horst 1 , Scherer Klaus, Heber Bernd 1 Ruhr-Universität Bochum, 2 From the presence of the 11-year Schwabe and the 22-year Hale period in numerous time series of climate indicators like tree rings, varves, precipitation, droughts or temperatures it has been concluded that solar activity has an influence on the terrestrial climate. While at present it is still unclear, however, whether this influence is direct (solar) or indirect (cosmic rays) and exactly which processes establish such relation, it is likely that the observed periods do contain valuable information. Here we follow up on our earlier suggestion that the Hale periodicity provides the ability to differentiate between climate forcings related to either solar electromagnetic or galactic cosmic radiation. We perform a detailed, comparative period analysis of solar irradiance and cosmic ray flux and we offer a hypothesis why the Hale period does occur in certain climate-indicative time series despite the insignificance or even absence of the Schwabe period.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The multi-year NLC data set above ALOMAR. Fiedler Jens , Baumgarten Gerd , Kaifler Natalie , Berger Uwe , Hoffmann Peter , Lübken Franz- Josef Leibniz-Institute of Atmospheric Physics (IAP) Noctilucent clouds (NLC), also called polar mesospheric clouds (PMC), are the visible manifestation of ice particles in the polar summer mesopause region and can be observed precisely by active laser remote sensing. Cloud parameters show variabilities ranging from minutes to decades, including tidal and solar cycle variations. Between 1997 and 2009 NLC have been observed by the ALOMAR Rayleigh/Mie/Raman (RMR) lidar in Northern Norway at 69N, 16E. During a total of 4105 measurement hours, being well distributed over the 13 years, season and local time, NLC were detected for 1735 hours, which is the largest NLC data base acquired by lidar. We will report on the variability of NLC parameters like occurrence, altitude, brightness and particle properties on different time scales. For interpretation of our lidar NLC data we use multi-year data sets obtained by colocated radars and LIMA (Leibniz Institute Middle Atmosphere Model). During the extended approach to the last solar minimum the occurrence rate of bright clouds did not follow the expected anti-correlation to solar radiation. Only since 2008, where the minimum was reached, this cloud class occurred more frequent again. This indicates that other processes than the widely assumed direct Lyman-alpha influence on water vapor have major impact on the NLC formation. We will investigate the local time behavior of NLC parameters and address the question of year-to-year variability of their tidal amplitudes and phases. While the phases of the cloud occurrence are remarkable constant during each year, altitude and brightness show a different behavior. Possible implications for satellite observations of PMC will be discussed.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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