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Published online by Cambridge University Press: 25 April 2016
In preparing this report, which covers the period July 1, 1987, to June 30, 1990, close collaboration has taken place between the two solar commissions (10 and 12), in order to avoid duplication and to ensure that appropriate topics are treated. Further information on solar physics may be found in the report of Commission 12. It is a pleasure to thank the reviewers who wrote the different sections of this report, which demonstrate the active and lively state of our subject. Unfortunately, two topics that we had hoped to include, namely “active regions” and “solar activity from space observations”, were unable to be completed in time, but they are to some extent covered in Sections 7 and 6.