Results of a ground-based CMB anisotropy experiment conducted at the Teide Observatory (Tenerife) are presented. The instrument is a four channel (3.1, 2.1, 1.3 and 1.1 mm) bolometer system coupled to a telescope consisting of a chopping off-axis parabolic primary mirror and an off-axis hyperbolic secondary. The resultant configuration is sensitive

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We show that cyclic activity and Maunder-type grand minima can be explained by a dynamo driven by the instability of magnetic flux tubes in the overshoot layer at the bottom of the solar convection zone. The combination of a threshold in field strength for dynamo action and random fluctuations due to magnetic fields from the turbulent convection

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