NORTHERN CROSS RADIOTELESCOPE
Live data from Medicina (IT - Bologna)

Maintained by Jader Monari & Massimo Silvestri
Google map click here http://goo.gl/maps/kYQRK  (Lat. 4431'27.70"N - Long. 11 38'41.97"E)




ULFO (Ultra Low Frequency Observatory) with:
  • ULFO induction coil receiver
  • Boltek EFM-100: Electric Field Monitor


ULFO Induction COIL - Magnetic field
The ULFO receiver (Ultra Low Frequency Observatory) is a ultra low frequency receiver (0.1Hz-35Hz) installed near Medicina (BO) close to the Northern Cross Radiotelescope (INAF institute).
The project started by the work followed respectively by Andrea Ghedi and Carla Cirolli has been supervised by Jader Monari during their thesis.
The system now is working by the support of ICPH and Renato Romero, and all the data are available.
The preliminary high sensitive lock-in receiver developed inside the INAF laboratory has been replaced with  a low noise amplifier ICS101 in order to simplify the design of the entire system and getting used of ULF reception.

A short article about the work of  Andrea Ghedi and Carla Cirolli can be found ICPH [CIPH]
Instead a description of the Renato Romero's receiver ICS101
 
The induction coil is made by a silicon iron (FeSi4 ?r = 4500) composite core of 75 mm diameter,  where has wound a enamelled copper wire 0.5 mm. a. The total length is 17 km for  100000 turns and the weight of the coil  is 35 Kg.


 

ULFO inside the lab for the last testings, some characterization phases and its preamplifier.



Here the live spectrogram, updated every 15 minutes. It shows the last 8 hours ULF activity,
from 0.1 to 35Hz.
    

Bottom part zooms on the 0.1 to 4 Hz range. FFT resolution 21 mHz, scroll time 40 seconds.


Spectrogram in 1 hour strips, from 0.1 to 35 Hz. Picture updated every 15 minutes.
  

   
FFT resolution 84 mHz, scroll time 4.6 seconds.

 

Multi-strip spectrogram in 1 day strips, from 0.1 to 10 Hz. Picture updated every 15 minutes.
  

   
FFT resolution 21 mHz,
scroll time 109 seconds.


Five days monitoring interaction in the same spectrogram, from 0.1 to 35 Hz.



FFT resolution 42 mHz, scroll time 8.35 minutes.


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



Scroll time 4.6 sec, updated every 60 minutes.



BOLTEK EFM-100 - Atmospheric Electric Field Monitor



      
Boltek EFM-100 receiver installed, principle of operation and head detail.

Other instrument detail can be found on the supplier web site:

http://www.boltek.com/product/efm-100-electric-field-monitor/



Last hour. Picture updated every 15 minutes




Last 8 hours. Picture updated every 15 minutes




One day. Picture updated every 15 minutes




Weekly. Picture updated every 15 minutes




Monthly. Picture updated every 15 minutes




Annual. Picture updated every 15 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://www.qsl.net/dl4yhf/spectra1.html .
Many thanks to Wolfgang Buscher for his support.




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