Whistler data, Todmorden UK 53.703N,2.072W,

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Format and fields

1: timestamp: unix epoch, +/- 8mS, as whistler crosses 8kHz;

2: date: YYYY-MM-DD;

3: time HH:MM:SS.sss;

4: dispersion: D_zero;

5: ps:  PCA score, detection significance, threshold of 2.0

6: bearing:   Degrees. positive = East, relative true North,
              -180.0 to +179.9.  This is the azimuth of the major axis
              of the polarisation ellipse;

7: polarisation:  L = left circular,
                  R = right circular,
                  as seen looking in the direction of the wave vector;

8: ellipticity:  major_axis/minor_axis of polarisation ellipse,
                 1.0 = circular, infinity = linear polarisation;

9: E/H:  Ratio E/H, very approximate.  Subject to unknown errors in
         effective height and loop area;

10:  N:  Number of points on the whistler trace over which the above
         parameters were averaged;  

Notes

• ps gives an indication of how reliably the whistler was detected. The detector has a threshold of ps = 2. It may be worth while selecting only those with, say, ps >= 3 (giving 10174 whistlers) to exclude marginal events.
• N indicates the number of points on the whistler curve which gave a reliable PCA result in which the gradient of the curve was a good match with the whistler curve. The signal parameters bearing, polarisation, ellipticity and E/H are averaged over these N points. Selecting whistlers with higher N will identify those which are likely to have more reliably determined parameters.

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