I wrote:
> The phase doesn't look very steady Markus.
Markus wrote:
> maybe the explanation is that with 10 minute averages my
> signal is just too close to the noise.
You're right. I confirmed this by injecting an artificial
carrier into the VLF recording at 8271.0025 at the same
average strength as your signal, then running this
signal through the same process. The result looks very
similar. Periods when your signal had crazy phase, so does
the artificial signal. The standard deviation of the phase
is a little better on the artificial signal: 37 degrees
compared with 51 degrees, but that's to be expected since
your signal won't have an exact constant phase and amplitude.
Below is your signal in 30 minute measurements (555uHz)
stepping 15 minutes
2016-03-20_12:00:00 0.10 fT -75.5 deg
2016-03-20_12:15:00 0.07 fT -79.4 deg
2016-03-20_12:30:00 0.07 fT -77.6 deg
2016-03-20_12:45:00 0.12 fT -93.5 deg
2016-03-20_13:00:00 0.10 fT -87.1 deg
2016-03-20_13:15:00 0.10 fT -80.5 deg
2016-03-20_13:30:00 0.12 fT -68.8 deg
2016-03-20_13:45:00 0.08 fT -93.5 deg
2016-03-20_14:00:00 0.08 fT -119.0 deg
2016-03-20_14:15:00 0.11 fT -81.1 deg
2016-03-20_14:30:00 0.14 fT -65.5 deg
2016-03-20_14:45:00 0.15 fT -66.1 deg
2016-03-20_15:00:00 0.11 fT -75.4 deg
2016-03-20_15:15:00 0.02 fT -121.4 deg
2016-03-20_15:30:00 0.07 fT -124.3 deg
2016-03-20_15:45:00 0.13 fT -91.9 deg
2016-03-20_16:00:00 0.13 fT -89.2 deg
2016-03-20_16:15:00 0.13 fT -113.7 deg
2016-03-20_16:30:00 0.10 fT -113.8 deg
2016-03-20_16:45:00 0.08 fT -106.3 deg
2016-03-20_17:00:00 0.09 fT -95.2 deg
2016-03-20_17:15:00 0.13 fT -94.4 deg
2016-03-20_17:30:00 0.09 fT -124.8 deg
Average -90.2 degrees, sigma 17.8 degrees and the artificial
signal has sigma 16.3 degrees at this setting.
One hour integration, 30 minute stepping
2016-03-20_10:30:00 0.09 fT -81.9 deg
2016-03-20_11:00:00 0.12 fT -78.4 deg
2016-03-20_11:30:00 0.11 fT -76.7 deg
2016-03-20_12:00:00 0.09 fT -75.9 deg
2016-03-20_12:30:00 0.08 fT -83.2 deg
2016-03-20_13:00:00 0.11 fT -76.9 deg
2016-03-20_13:30:00 0.09 fT -88.0 deg
2016-03-20_14:00:00 0.10 fT -83.7 deg
2016-03-20_14:30:00 0.13 fT -70.1 deg
2016-03-20_15:00:00 0.08 fT -93.6 deg
2016-03-20_15:30:00 0.10 fT -101.9 deg
2016-03-20_16:00:00 0.11 fT -99.8 deg
2016-03-20_16:30:00 0.09 fT -104.9 deg
2016-03-20_17:00:00 0.09 fT -109.5 deg
14 degree sigma.
--
Paul Nicholson
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