The term "Alpha effect" can refer to different concepts depending on the context. Here are a few predominant uses of the term: 1. **Finance and Investments**: In finance, the Alpha effect relates to the performance of an investment relative to a benchmark index, usually in the context of active portfolio management. Alpha is a measure of the excess return of an investment compared to a market index.
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The alpha effect is the part of a mean-field electromotive force linear in the mean magnetic field itself, . The alpha tensor can be anisotropic; it need not be a scalar multiple of the identity. Its curl can couple transverse mean-field components and produce an alpha-squared dynamo.