JA 4 - SOLAR RELATED VARIABILITY OF THE ATMOSPHERE (IAGA, IAMAS)

Convenor – Christoph Jacobi
Co-convenors - Katja Matthes, Nick Pedatella, Elisa Manzini, Werner Schmutz and Hua Lu

The solar influence on the climate keeps attracting much interest presently. This includes in particular the role of the sun in future climate variability as an important aspect taking into account changes like a possible decline of solar irradiance. State-of the art climate models include a well resolved stratosphere and partly mesosphere. This allows the prediction of global climate and its changes taking into account expected solar related variability at short to long time scales. In the middle and upper atmosphere solar related electromagnetic and particle variability is one dominant forcing mechanism for atmospheric variability at time scales from days to decades. From available datasets it is not always straightforward to distinguish between solar and meteorological influences. Time series are often too short to clearly identify, e.g., the 11-year solar cycle in the presence of nonlinear trends owing to lower atmospheric variability. The effect of planetary waves at time scales of days to weeks is difficult to extract from time series in the presence of the solar rotation effect and harmonics.

Results from observations, including observation and modelling solar forcing, theoretical work and modelling efforts to quantify meteorological and solar effects on the lower, middle, and upper atmosphere are welcome.