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The solar-stellar experiment started with the HK Project at Mount Wilson Observatory initiated by Olin Wilson in 1966, continued with the hunt for solar analogs up through the eighties and nighties and have culminated so-far with the remarkable results from CoRoT and Kepler.  \section{Introduction}  We With  the term \textit{the solar-stellar connection} we understand primary the field where studies of Sun-like stars are used to increase our understanding of the Sun. This fieldof cause  includes a great variety of different subjects, but for this review we have make a selective of what we think are the most important subjects: \begin{itemize}  \item Magnetic fields 

\item Convection  \end{itemize}  One chapter will thus be dedicated to each of these subjects in this review. We have also dedicated a chapter to the discussion of the 'Solar Analogs' and 'The Sun in Time' projects \citep{Cayrel_de_Strobel_1996, G_del_2007}.  This review will be based on \cite{Hall_2008} and should start by discussing the main ideas in this review. 

The sounding stellar cycles with Kepler project: \cite{Karoff_2009}, \cite{Karoff_2013}  \section{Magnetic fields}  It is not possible to measure stellar magnetic fields directly with e.g. a Hall sensor. Instead the effect of magnetic fields can be observed through mainly:  \begin{itemize}  \item Observations of chromospheric non-thermal emission generated by magnetic fields (This is mainly done in the Ca II H & K lines, \citet{Hall_2008})   \item Observations of coronal non-thermal emission generated by magnetic fields (This is mainly done in X-ray, ref)  \item Observation of degeneration of spectral lines due to the Zeeman effect \cite{Zeeman_1897}  \end{itemize}  The study \cite{Wilson_1963}  \section{Rotation}  \section{Convection}