A few comments on your video; you can listen in to VLF transmitters with simple equipment, even a coil of wire can be plugged directly into the mic input of a computer with spectrum software to see the carrier frequency peaks of the transmitters in Europe and the USA. NAA has a service area of about 5000 km but most of the transmitters have lower power, from 50 to 500 KW ERP. Geophysicists use VLF for mineral and groundwater exploration, the horizontally polarised field generates local secondary induction in steep-dipping mineralised and water-bearing geological structures which can be located by the tilt angle of the resultant elliptically-polarised secondary field. The phase angle between primary and secondary fields also provides some information on the conductivity of the bedrock and soil cover. There are also pipe locator instruments which can use the VLF signals and sometimes these work better than the usual inductive Tx-Rx systems or the 50/60 Hz mains hum detectors.
really excellent talk!
Very informative and enjoyable, thank you from Copenhagen
A few comments on your video; you can listen in to VLF transmitters with simple equipment, even a coil of wire can be plugged directly into the mic input of a computer with spectrum software to see the carrier frequency peaks of the transmitters in Europe and the USA. NAA has a service area of about 5000 km but most of the transmitters have lower power, from 50 to 500 KW ERP.
Geophysicists use VLF for mineral and groundwater exploration, the horizontally polarised field generates local secondary induction in steep-dipping mineralised and water-bearing geological structures which can be located by the tilt angle of the resultant elliptically-polarised secondary field. The phase angle between primary and secondary fields also provides some information on the conductivity of the bedrock and soil cover. There are also pipe locator instruments which can use the VLF signals and sometimes these work better than the usual inductive Tx-Rx systems or the 50/60 Hz mains hum detectors.
what are your thoughts on electron precipitation by ULF/VLF