Open Access
Table 1
Features provided to the whistler detection algorithm.
| Feature name | Description | Units | Input |
|---|---|---|---|
| Energy | Sum of squares of F R , | nT2 | Time series |
| Variance | Variance of dF R /dt. | nT2 s−2 | Time series |
| Absolute maximum | Maximum of dF R /dt. | nTs−1 | Time series |
| Fraction over half maximum | Fraction of values of dF R /dt exceeding 40% of the Absolute maximum. | – | Time series |
| RMS | Root mean square of dF R /dt. | nTs−1 | Time series |
| Standard deviation of variance | Standard deviation of the variances of dF R /dt using a sliding window of 30 points. | nT2 s−2 | Time series |
| Variance of the ZCA | Variance of the Zero Crossing Area (ZCA): Integral of dF R /dt between successive crossings of 0. | nT2 | Time series |
| Variance of the normalized ZCA | Variance of the ZCA of dF R /dt normalised by their durations. | nT2 s−2 | Time series |
| Mean of the differences of ZCA | Average of the difference of consecutive ZCA of dF R /dt. | nT | Time series |
| Variance of the differences of ZCA | Variance of the difference of consecutive ZCA of dF R /dt. | nT2 | Time series |
| Slope of ASD maxima | Number of adjacent frequency bins for which the difference between the position of their maxima is less than 3 time-steps. | – | ASD |
| Proximity of ASD maxima | Number of adjacent frequency bins for which the positions of their maxima are separated by less than 3 time-steps. | – | ASD |
| ASD maxima separation | Temporal separation between the earliest and latest maximum of any frequency bins relative to the number of frequency bins. | – | ASD |
| Standard deviation of ASD sums | Standard deviation of the sums of the ASD values between 16 and 120 Hz for each time-step. | nT/
|
ASD |
| Strength of maximum ASD | Fraction of the maximum value of the sums of the ASD values between 16 and 120 Hz at each time-step over the total of the ASD values in the time window. | – | ASD |
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