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Unusual Programmes are somewhat similar to Common Programmes, in that the data from these experiments are available to scientists from all member countries of the EISCAT Scientific Association. The difference is that such experiments often do not form part of the normal schedule of operations. The existence of Unusual Programmes is intended to provide a mechanism whereby EISCAT can respond quickly to events of geophysical interest (proton events, earthward-directed CMEs etc.). Under these conditions, the EISCAT Director or his designated deputy can instigate an experiment at short notice, with the mode being chosen according to the prevailing conditions.