VLF MONITORING STATION
Live data from CUMIANA (TO), NW Italy, south Europe
(To see on google map click this link (44,96° NORTH - 7,42° EAST)
System one, Electric Field: Marconi Antenna (Ogg/Vorbis Stream) + Geophone
coming from Marconi antenna: a big "T" 11 m high with 30m long
You can listen the audio streaming live clicking here: http://188.8.131.52/vlf15.m3u
If using Windows Media Player you can't open the stream go to http://xiph.org/dshow/ and download the codec
named "opencodecs_0.85.17777.exe" (2,53MB), or use VLC to reproduce it directly.
The audio streaming server is provided by
See at Paul's page "Live VLF Natural Radio" for others audio stream available: http://abelian.org/vlf/
Here below the first LIVE spectrogram,
updated 30 minutes.
It shows the last 8 hours VLF activity, as received by Marconi antenna (electric field).
Picture, every 30 minutes, shows last 8
hours. All date and times are in UTC.
The scroll time is 40 s, and the frequency resolution 84 mHz.
As the receiving station is placed not too far from an industrial area, sometimes strong tones are detected by geophone sensor, caused by mechanical machine (1 km far from here).
Electric filed multistrip daily
representation, useful for comparing anomalies from day to day:
Scroll time 110 sec, updated every 30
Geophone Multistrip hourly representation,
useful for local seismic events correlation:
Scroll time 4.6 sec, updated every 60 minutes.
Here below the same data elaborated as plotting traces. The picture shows the last 30 hours, and values are detected every 150 s.
Picture, updated every 30 minutes. Four traces are reported:
9 kHz dreamers band
Elecric filed always coming from Marconi antenna, monitoring of 9 kHz band. A reception window centered on 8970 Hz on the top and 6470 Hz on the bottom with a resolution of 3.8 mHz, for the monitoring of testing transmission of radio experimenters.
It shows last 12 hours activity. Picture updated every 30 minutes.
System two, magnetic field: INDUCTION COIL
(see for construction details the article http://www.vlf.it/romero3/ics101.html)
Panoramic view captured from my garden, and a couple of Induction coils, orthogonally placed, inspected by a hen.
Spectrum scale: magnetic components of the
spectrogram below with long term average curve (red) and last
Frequency range 0.1 – 35 Hz, with a sensitivity of 1 pT at 1 Hz, here with a 30 Hz low pass filter turned ON.
FFT resolution 10,5 mHz, scroll time 40 seconds. Schumann resonances are almost always visible: when not covered by local noise coming from 380 kV high power line. Also the cars, passing 25 m away from the sensor, leave their trace in the area below 10 Hz. The coil is simply connected to the LINE input of a Realtek 97 audio card. Picture updated every 30 minutes. The spectrogram part below, 0,1 to 4 Hz, it is good for the PC1 detection.
Another representation from the same system:
Induction coil multistrip spectrogram, for
shorter time event representation. Magnetic field received by
induction coil. FFT with 168 mHz resolution, scroll time 4.5
sec. More than 4 hours are showed. Picture updated every
Multistrip daily representation, useful for
comparing anomalies from day to day:
Scroll time 110 sec, 7 mHz resolution, updated every 30 minutes.
Here below the real time situation about lighting strikes in Europe. Courtesy of http://www.blitzortung.org
Unattended operations, signal conditioning,
spectrograms and RDF functions are performed with SpectrumLab: http://freenet-homepage.de/dl4yhf/spectra1.html
. Many thanks to Wolfgang Buscher for his support.
Automatic FTP process is realized with SyncBack Freeware V3.2.14 http://www.2brightsparks.com/downloads.html.
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