Laurentian University Radio Observatory
Live data from Sudbury, Ontario, Canada
Maintained by Kevin Saroka

Coordinates 46.49 N, 81.01 W (click here for location on Google map)

ULF Induction Magnetometer-Magnetic Field

The magnetometer is situated in a quiet area on the Laurentian University campus on a rock-face in Sudbury, Canada.  Data is streamed continuously to a laptop placed inside of the Laurentian University Arboretum Pavilion approximately 50 m from the magnetometer using standard 2-channel microphone cabling.

The magnetometer consists of approximately 96000 turns of AWG 28 copper wire with steel welding rods inserted to increase permeability and is modelled after Hans Michlmayr’s design (; it is housed in a wooden crate along with dry sand to maintain stability and oriented to receive the N-S component.  The input is fed into an ICS101 preamplifier/filter designed by Renato Romero with LPF turned off (  

Map showing location of Sudbury, Ontario, Canada

Laurentian University Arboretum Pavilion on a rainy day

Magnetometer during early stages of winding
Testing of induction coil in the spring facing Laurentian University campus at sunset.  It is now situated here permanently.

ULF magnetic field

Below is a spectrogram updated every 15 minutes displaying the last 8 hours of activity between 0.1 and 36 Hz.  Bottom part is 0-4 Hz.  Evident are continuous 7 Hz (campus power generator?) and 20 Hz (local mining company, Bell telephone line?) and 31 Hz strong signals of yet unknown origin, but are pervasive all day.

Magnetic field hourly multistrip shows ULF activity within the 0.1 to 36 Hz range showing last 6 hours.  Data is updated every 15 minutes.

Magnetic field daily multistrip shows 0-30 Hz activity of the last 6 days.  Scroll time is 110 seconds and is updated every 15 minutes.   Useful for tracking increases in Schumann resonance signal associated with local and global lightning.

Magnetic field daily multistrip shows 0-10 Hz activity of the last 6 days.  Scroll time is 110 seconds and is updated every 15 minutes.  Useful for checking the occurrence of geomagnetic pulsations, onsets of geomagnetic storms, and spectral resonance structures (SRS).

ELF - Electric Field  

LNVA_24-20 Low noise voltage Amplifier, basic circuit. I adopted the version with AD820 very low current noise operational amplifier, as reported here: LNVA.pdf

Marconi antenna; 3m tall 10 m wide top hat equipped with LNPF-24 preamplifier designed by Renato Romero. Gain set at +24 dB and 0-100 Hz filter turned on
The audio streaming of this system is available here:

0-100 Hz reception.  Picture updated every 15 minutes.  Scroll time 40s, frequency resolution 84 mHz.  Schumann resonances are almost always visible.

0-34 Hz daily multistrip.  Scroll time 4.5 seconds, FFT resolution 168 mHz.  Updated every 15 minutes.

0-40 Hz multistrip: Scroll time 110 seconds, 7 mHz resolution, updated every 15 minutes.

Unattended operations and spectrograms are perfomed with SpectrumLab:  Extra special thanks go to Renato Romero for his patience and help in constructing the magnetometer and for hosting the data on  Additional thanks are also extended to the Laurentian University Biology Department to provide space for continuous monitoring. 

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