|Spectrograms for 26th April 2013, showing the Schumann resonances, lightning storm activity between 11.00 and 18.00 and the induced 25 Hz signal from the power grid|
|Spectrograms for 7th March 2013: Spectral resonance structures between 18.00 and 24.00. |
The 8 Hz Schumann resonances is also visible
There are plenty of other odd (and for me, unexplained) phenomena in this new dataset. I’ll post some of the more mysterious ones for your opinion at some point (if Lauren lets me!).
By Ciaran Beggan