[TangerineSDR] VLF SID Event on Three VLF Transmitters!

[Jonathan]

A VLF SID event was observed on *THREE* VLF transmitters (NAA at 24 kHz,
NLK at 24.8 kHz, and NAU at 40.8 kHz) at just after 17:30 UT on 3/2/2022 at
the Springbrook Township, PA VLF observatory site! Here are relative
amplitude and phase plots. You can see the sudden enhancement of
propagation and change in phase below of NAA:

 NLK:
NAU:
The affect on NAU is smaller, but observed VLF SIDs are path dependent.
Phase data from NAU is erroneous.

Here are the plots with a 75 minute time span showing the a better view of
the sudden propagation enhancement.

NAA:
NLK:
NAU:
Again, phase data for NAU is erroneous.

What is so exciting is that this SID was observed on three VLF
transmitters! Normally, you don’t see that very often!

Jonathan
KC3EEY
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