<div dir="ltr">Forgot to add that my Flex-1500 + GPSDO monitoring the WWV 10 MHz carrier showed a sharp +3 Hz frequency shift spike at the time the M2.0 solar X-ray flare hit. I suspect that the SID event went farther up the EM spectrum. I use a slightly modified version of Steve Cerwin, WA5FRF's Spectrum Laboratory script for this purpose.<div><br></div><div>73,<br>Robert, VA3ROM</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 5, 2022 at 12:20 AM <<a href="mailto:tangerinesdr-request@lists.tapr.org">tangerinesdr-request@lists.tapr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send TangerineSDR mailing list submissions to<br>
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Today's Topics:<br>
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1. VLF SID Event on Three VLF Transmitters! (Jonathan)<br>
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----------------------------------------------------------------------<br>
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Message: 1<br>
Date: Sat, 5 Mar 2022 00:19:39 -0500<br>
From: Jonathan <<a href="mailto:emuman100@gmail.com" target="_blank">emuman100@gmail.com</a>><br>
To: TangerineSDR Listserv <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>>, Unknown<br>
<<a href="mailto:hamsci@googlegroups.com" target="_blank">hamsci@googlegroups.com</a>><br>
Subject: [TangerineSDR] VLF SID Event on Three VLF Transmitters!<br>
Message-ID:<br>
<<a href="mailto:CAOY0kB0dFYzAr_vJ0tLBT5ej1OmG_YZ86y79ATz_OLrBhOfq3A@mail.gmail.com" target="_blank">CAOY0kB0dFYzAr_vJ0tLBT5ej1OmG_YZ86y79ATz_OLrBhOfq3A@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
A VLF SID event was observed on *THREE* VLF transmitters (NAA at 24 kHz,<br>
NLK at 24.8 kHz, and NAU at 40.8 kHz) at just after 17:30 UT on 3/2/2022 at<br>
the Springbrook Township, PA VLF observatory site! Here are relative<br>
amplitude and phase plots. You can see the sudden enhancement of<br>
propagation and change in phase below of NAA:<br>
<br>
NLK:<br>
NAU:<br>
The affect on NAU is smaller, but observed VLF SIDs are path dependent.<br>
Phase data from NAU is erroneous.<br>
<br>
Here are the plots with a 75 minute time span showing the a better view of<br>
the sudden propagation enhancement.<br>
<br>
NAA:<br>
NLK:<br>
NAU:<br>
Again, phase data for NAU is erroneous.<br>
<br>
What is so exciting is that this SID was observed on three VLF<br>
transmitters! Normally, you don?t see that very often!<br>
<br>
Jonathan<br>
KC3EEY<br>
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