CUMIANA VLF MONITORING STATION
Live data from CUMIANA (TO), NW Italy, south Europe
Maintained by Renato Romero

Lat. 44 57 21,924 N
Lon. 7 25 16,435 E
To see on google map click this link  https://goo.gl/maps/7wviV5M8BV9T6F2A9



System one, Electric Field: Marconi Antenna (Ogg/Vorbis Stream) + Geophone

Audio signals coming from Marconi antenna: a big "T" 10 m high with 15 m long top hat, 
You can listen the audio streaming live clicking here:  http://5.9.106.210/vlf15.m3u

 

The audio streaming server is provided by Paul Nicholson.
See at Paul's page "Live VLF Natural Radio" for others audio stream available: http://abelian.org/vlf/

VLF monitoring

Here below the first LIVE spectrogram, updated 30 minutes.
It shows the last 8 hours VLF activity, as received by Marconi antenna (vertical electric field).


Marconi Antenna + Geophone


Amplitude scale: two channels listed below.

  • Channel 1, seismic monitor. Frequency range: 1 to 30 Hz for the top spectrogram. Signals coming from geophone I/O SENSOR Nederland b.v. model SM-4/UB8 (see at SM-4_Brochure.pdf) 40 dB amplified with a very low noise preamplifier.
  • Channel 2, electric field. Frequency range: 1 to 105 Hz for the bottom one. Signals coming from Marconi antenna, with a low noise current preamplifier, placed at the bottom of it  (LNVA_20-24).

Picture, every 30 minutes, shows last 8 hours. All date and times are in UTC.
The scroll time is 40 s, and FFT frequency resolution 21 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 minutes, FFT frequency resolution 10.5 mHz.

Geophone Multistrip hourly representation, useful for local seismic events correlation:


Scroll time 4.6 sec, updated every 60 minutes, FFT frequency resolution 112 mHz

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:

  • Geophone trace , it shows the average and peak signals coming from the geophone sensor, in 1-20 Hz range.
  • ULF noise 10 Hz , it shows the medium value between 3 and 30 Hz.
  • ELF noise 100 Hz , it shows the medium value between 30 and 300 Hz.
  • 2th SR freq. , it shows the frequency of second Schumann resonance (in Hz).



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.

ULF magnetic field

Spectrum scale: magnetic components of the spectrogram below with long term average curve (red) and last waterfall line. 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 at night. During the daytime the signal from a single track railway line, which runs 4 km from the monitoring station, prevails. A few kilometres away there is also a 380 kV high-voltage power distribution line.
The ICS101 induction coi is placed in the garden, 30 m away from the station, where it is connected by a twisted pair to the line input of a sound card. Image updated every 30 minutes. The bottom section magnifies the range from 0.1 to 4 Hz, good for 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 84 mHz resolution, scroll time 4.5 sec.  More than 4 hours are showed. Picture updated every 30 minutes.

Multistrip daily representation, useful for comparing anomalies from day to day:

  

Scroll time 110 sec, 7 mHz FFT resolution, updated every 30 minutes.


Here below the real time situation about lighting strikes in Europe. Courtesy of http://www.blitzortung.org

European map of lightning. It can sometimes
                be off line for work in progress. If the map is not
                displayed go to: 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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