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auroral oval. auroral oval. An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
In this figure, the blue area corresponds to the Area Under the curve of the Receiver Operating Characteristic (AUROC). The dashed line in the diagonal we present the ROC curve of a random predictor: it has an AUROC of 0.5. The random predictor is commonly used as a baseline to see whether the model is useful.