|
Thanks again Paul for the effort. The result
does make sense now. The one-hour averages seem to show a slow trend
towards negative (retarded) phase after 15 UT, which may be caused by
decreasing solar illumination as the evening approaches.
Best 73,
Markus
Sent: Wednesday, March 23, 2016 9:55 PM
Subject: Re: VLF: EbNaut 8270.1, Sunday Mar 20
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
--
|
