giovedì 29 giugno 2017

Daily Recurrent Ladders in VLF

Following my previous publication at the link : 


I have checked several days one of the scheme of the ladders that occurs every days starting with a similar pattern at : 7.00 - 9.00 and 11.00 UTC as in the spectrogram recorded in the VLF Observatory of Turin in Electric field  in real time at the link : http://www.sidmonitor.net/gallery/station.html 


The same was received in Kiel in Electric field 




The strange is that in Kiel on H field , only the 7.00 - 11.00 UTC patterns are received 



My personal remarks could suggests that : 

A) This patterns are broadcasted from three different locations
B) The second pattern lies in a direction where there is a null in the directivity  of the H sistem of the Kiel Observatory 
C) For some reasons this VLF signals are broadcasted in a " Frequency Hopping way " 

Further investigation will be recording and demodulating this signals .


Images from the Kiel Longwave Monitor at the links :



and published under permission of : 

Peter Wilhelm Schnoor
Kiel Longwave Monitor

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