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These are the proceedings of the Symposium 3 of JENAM 2011 on new scientific challenges posed by the Sun. The topics covered are §1. The unusual sunspot minimum, which poses challenges to the solar dynamo theory §2. The Sun s Terra-Hertz emission, which opens a new observational window §3. Corona wave activity §4. Space weather agents - initiation, propagation, and forecastingIn 21 in-depth contributions, the reader will be presented with the latest findings.