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

[Jonathan]

Come to think of it, does anyone have access to GNSS TEC plots from GNSS
receivers in Pennsylvania or surrounding states on both days?

Jonathan
KC3EEY

On Mon, Sep 25, 2023 at 6:55 AM Jonathan <emuman100 at gmail.com> wrote:

> 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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