![About ELF Group](index/images/spectrum1.png)
Daily power spectrum from Patagonia station ELA10 (2016-04-03). Strong 50Hz power line is observed.
![About ELF Group](index/images/HWK2013.png)
Lightning location in HWK system (2013), an experimental simultaneous observation at three points.
![About ELF Group](index/images/spectrum2.png)
Averaged power spectrum from Hylaty Station (2007), 60Hz ELF receiver ELA7. Aside from the seven Schumann resonances and strong 50Hz line of electrical grid, a clean 16,66Hz line from Ukrainian electrical trains is observed .