SPARC-SOLARIS1 is an international working group to study the effects of solar influence on climate with special focus on the importance of middle atmosphere chemical and dynamical processes and their
coupling to the Earth's surface with state-of-the art chemistry-climate models (CCMs) as well as mechanistic models and observations. We foster and initiate detailed studies on the "top-down" solar UV
and the "bottom-up" TSI mechanisms, as well as on the impact of high energy particles.
In addition, SOLARIS aims to provide a platform for the coordination and discussion of solar-related studies. This includes recommendations for the solar irradiance and
solar proton flux data used to drive middle atmosphere and climate models within e.g. the SPARC-CCMVal initiative and the CMIP5 simulations.
Second SOLARIS Meeting - Potsdam 2010:
 Picture: Jan Dostal (GFZ Potsdam)
The start of the SOLARIS activity is described in the SPARC Newsletter No. 24 and is an extension of the GRIPS solar influence
intercomparison (Matthes et al., 2003; Kodera et al., 2003). SOLARIS collaborates with a number of other programs and groups such as the SPARC-CCMVal,
SPARC-DynVar, the High-Energy Precipitating Particles in
the Atmosphere (HEPPA-MMI) initiative, the EU COST project: "TOSCA: Towards a sounder assessment of the impact of solar variability on the Earth's climate", as well as task 1 of the SCOSTEP CAWSES II
(Climate and Weather of the Sun-Earth System) program.
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