[TangerineSDR] Effect of GNSS Degradation During Geomagnetic Storm 9/19-20/23

[Jonathan]

A really cool effect was observed on the VLF system during the strong
geomagnetic storming of 9/19 and 9/20. I believe that the scintillation of
the GNSS signal during that period produced a lot of error in the timing
solution of the GNSS receiver which resulted in a sawtooth characteristic
in the absolute phase measurement in NAA, which that measurement is
referenced to GNSS timing. This geomagnetic storming event caused visible
aurora, characteristic of low latitudes (red emissions) across
Pennsylvania.

Here is the plot of the NAA diurnal on 9/19/23 showing the effect of the
scintillation in the absolute phase measurement as well as two SIDs caused
by solar flares:

And on 9/20/23, showing more SIDs and the sawtooth effect past the initial
onset of the geomagnetic storm:

Not only that, the nighttime portion of the diurnal (00:00-10:00) show the
D layer being affected by the CME, showing different absorption variation
than the night before. There are some SIDs as well, so these plots are
indicating quite a bit of activity and a really nice observation.

Jonathan
KC3EEY
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