ELF

VAL TRONCEA  ELF GALLERY

Click to zoom the image
During the month of August 2014 was placed one ICS101 induction coil  in the silent Troncea Valley Natural Park, over the western Alps. We were able to capture a  geomagnetic pulsation (PC1)  the night between 19 and 20 August.

please click    HERE     to access  ELF data.   

Electromagnetic Pollution Comparison

Electromagnetic Pollution Comparison from 3 different sites taken with the ICS 101 Induction Coil in the range frequency of 0-30 Hz (ELF , Extremely Low Frequency) while over mountains are clearly visible the four Schumann resonances, getting closer to the city , the more electromagnetic pollution increases, until they disappear entirely, covered by ther radio noise of power lines, engines , and electrical equipment.

IONOSPHERIC ALFVEN RESONANCES (IAR)


25 October 2013

One of  our last objectives it's to use the ICS 101 Induction Coil to find and discover structures below last Schumann Resonance at 8 Hz. There are some phenomena already studied since the early 80's as the resonances of Alfven and geomagnetic pulsations (PC1) This test took place the day 25 october 2013.. I brought the ICS 101 back up in the mountains at an altitude of almost 2000 meters above the sea level. The objective of this test was indeed "capture" a geomagnetic pulsation PC1, given the strong X-ray activity of the sun with countless x-flare that we could observe also in our  VLF station. ( http://www.sidmonitor.net/datareport/index.html ) The kp index ( http://www.swpc.noaa.gov/info/Kindex.html )  was low too , optimal thing to be able to see even the SRS or IAR ( Ionospheric Alfvn Resonances). Despite the PC1 are often linked to the IAR, on this occasion we failed to detect any pulsation. However the Alfvn were finally visible! You can note them as  long horizontal streaks that depart from 0.5 to almost 7 Hz .Alfven wave resonances are an interesting phenomenon well described in the literature (Polyakov and Rapoport, 1981). These wave formation region is located between  two bends of the plasma density profile : in the lower part of the ionospheric F region and at altitudes of about 1000-3000 Km. In this region Alfvn waves are entrapped and form standing waves. The IAR are not a daily phenomenon but require a specific state of the ionosphere: their occurrence probably drops with an increase in the global magnetic activity. Unstructured wave activity [ Potapov 2006] in a frequency range of up 4-5 Hz is seen to persist up to 11.00 UT after which a few well-expressed equidistant bands appear, their frequencies slowly increase until the onset of local night. This record was obtained in a magnetically quite time : the Kp index did not exceed 2.

You can see full spectrum  HERE  

The ICS 101 during this test : A   B


FIRST HIGH ALTITUDE TEST


21 September 2013

And finally we have made it. First test of the new ICS 101 Induction Coil in Troncea Valley, West Alps, Italy. Clearly visible the first four Schumann Resonances in the magnetic field also , the much more difficult and hard to receive: The Alfvn Resonances . The instrument responds well despite having been adapted for use in the field from 24v to 12v.

The great sensitivity At 1 Hz measured of 0,2 pT with Low Pass Filter on cutting all over 30 Hz and the final amplifier gain set to 20db in conjunction with the calm and radio-pollution free from power lines (50 Hz) of the deep West Alps has allowed us to make this last awesome test awaiting to mount the ICS 101 into a fixed position that will complement (hopefully) to Cumiana one ( http://www.vlf.it/cumiana/livedata.html ) and the other from Radiotelescope of Medicine (BO) ( http://www.ciph-soso.net/vfl_it/medicina_live.html ) , where It's in use the same model of the ICS 101 for the magnetic field in the ELF frequency range (0-30Hz).

SETTING UP THE ICS 101


3 September 2013

The first test took place in the town of Savi, Monferrato. The coil was placed in the middle of a field approximately 2.3 kilometers from a railway network and the recording of the spectrogram above reproduces the results. At each passage of a single train  the coil recorded a strong trace from 0 to 15 Hz most likely given by the slide on the rails and sparks micro sparks of the train  pantograph  on the power supply. It also sees the ignition of a car, a fiat punto, about 30 meters from the coil! Techincal detail about the ICS 101 here : http://www.vlf.it/romero3/ics101.html


HERE   is the Analysis of the spectrogram. You can see the traces left by sliding on the rail tracks at 6-7 Hz spaced horizontal probably a long tunnel about twenty meters. (A-B-C F-D-)and the sparks of the train  pantograph (?) (G-H) in the background covered by the local noise, the first and the second Schumann resonance.


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