Hello Group,
Recording HBG75 (75 kHz) over the whole last week I found a
strong anomaly at Saturday, 14th. I observed a steep
increase of field strength (9dB) followed by a smooth
decrease looking like a typical exponential function.
Looking to sites offering geomagnetic data I could not
explain it. So my first assumption was that it could have
been an artefact.
Expanding the graph to higher zoom level showed the typical
weak 60sec. rhythm of HBG due to my short integration time
in front of the A/D-Convertor (time constant 2.6sec.). So
I'm sure that it was the signal of HBG and not any kind of
noise source.
J.J.Delcourt from RMI gave the explanation: It was the
influence of a Solar Flare on LF propagation. (Thank you!) I
never observed this before...
A plot of this event can be found there:
ftp://ftp.rz.uni-kiel.de/pub/nephro/nephlab/lp/solarflare.gif
54°16'N / 10°04'E, JO54ag
73 es gl de Peter, DF3LP
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