What Alfa index range indicates disturbance?

The Alfa index is a crucial metric used to indicate the level of disturbance in oceanographic and acoustic conditions. An Alfa index in the range of 25-50 specifically points to moderate disturbance. This range signifies that the environmental conditions are starting to show signs of variability that can affect acoustic performance and oceanographic measurements.

In practice, an Alfa index below 25 generally suggests a relatively undisturbed environment, while any values above 50 might indicate significant disturbances, which can create challenges for accurate data collection and analysis. The range of 25-50 serves as an important threshold where operators should remain vigilant and aware of possible impacts on their operations or assessments due to the disturbance.

Choosing this range demonstrates an understanding of how disturbances impact acoustic measurements and the importance of monitoring environmental conditions for effective fleet operations.