<div dir="ltr">Also observed at my SuperSID receiver + CCW VLF-HF active vertical in Thunder Bay, Ontario, Canada (Grid: EN58JK48TO): NPM, NAA, NLK and NML. But at NML the M2-class solar X-ray flare occurred near my solar noon (1810Z) so NML's shark fin was inverted as NML signal was heading south and NAA signal was heading north. I've heard about the inverted shark fin but this was the first time I've seen it. I just assume it's because the flare and my solar noon were pretty much occurring when my local ionosphere was near maximum TEC? It was so very cool to see the inverted shark fin and the others all vertical!<div><br></div><div>Rodney at the AAVSO solar group sent me the SID Data Grabber (SDG) display of the event and I've just joined up to send in monthly reports of my local SID data if and when I spot SID events. Apparently, I'm the only one in the group who is using an E-field antenna so it was great to know that my station is actually working and spotting SID events. But my bad for not checking my data every day. If I hadn't sent a query email asking about the SDG AAVSO program I would have never known that I captured a SID!</div><div><br></div><div>Here's hoping that there are a lot more SID shark fin events as we head towards solar maximum and then some!!</div><div><br></div><div>73,</div><div>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" target="_blank">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>
<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
or, via email, send a message with subject or body 'help' to<br>
<a href="mailto:tangerinesdr-request@lists.tapr.org" target="_blank">tangerinesdr-request@lists.tapr.org</a><br>
<br>
You can reach the person managing the list at<br>
<a href="mailto:tangerinesdr-owner@lists.tapr.org" target="_blank">tangerinesdr-owner@lists.tapr.org</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of TangerineSDR digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. VLF SID Event on Three VLF Transmitters! (Jonathan)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
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>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment.html" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment.html</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.14.49 PM.jpg<br>
Type: image/jpg<br>
Size: 71199 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.27.41 PM.jpg<br>
Type: image/jpg<br>
Size: 57705 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0001.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0001.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.26.29 PM.jpg<br>
Type: image/jpg<br>
Size: 56112 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0002.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0002.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.25.04 PM.jpg<br>
Type: image/jpg<br>
Size: 85346 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0003.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0003.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.19.58 PM.jpg<br>
Type: image/jpg<br>
Size: 95734 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0004.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0004.jpg</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: Screen Shot 2022-03-03 at 11.21.40 PM.jpg<br>
Type: image/jpg<br>
Size: 71655 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0005.jpg" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20220305/864f04f5/attachment-0005.jpg</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
<br>
<br>
------------------------------<br>
<br>
End of TangerineSDR Digest, Vol 36, Issue 1<br>
*******************************************<br>
</blockquote></div>