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

John Ackermann jra at febo.com
Mon Sep 25 08:03:50 EDT 2023

In a rush right now so more later, but I've been monitoring four GNSS/GPSDO for the last few weeks trying to catch correlations with space weather events.  I'll post more details later today.


On Sep 25, 2023, 6:55 AM, 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
>the GNSS signal during that period produced a lot of error in the
>solution of the GNSS receiver which resulted in a sawtooth
>in the absolute phase measurement in NAA, which that measurement is
>referenced to GNSS timing. This geomagnetic storming event caused
>aurora, characteristic of low latitudes (red emissions) across
>Here is the plot of the NAA diurnal on 9/19/23 showing the effect of
>scintillation in the absolute phase measurement as well as two SIDs
>by solar flares:
>And on 9/20/23, showing more SIDs and the sawtooth effect past the
>onset of the geomagnetic storm:
>Not only that, the nighttime portion of the diurnal (00:00-10:00) show
>D layer being affected by the CME, showing different absorption
>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.
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