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<div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">Nathaniel,</span></span><br></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">In reference to seeking more information on the state of the atmosphere during the Hunga-Tonga Ha-apai volcanic eruption.</span></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">Even if it is non 10 MHz WWV Grape-1 receiver data plots.</span></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div dir="ltr" data-setdir="false">On Saturday, January 15, from 1346 to 1426 UTC, started hearing multiple central Mediterranean Sea stations, Italy, Greece, </div><div dir="ltr" data-setdir="false">with others along the Adriatic Sea on SSB on 11 meters. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Signal strengths deviated from fairly good to moderately strong with moderate QSB. Average distances reached up to 4X </div><div dir="ltr" data-setdir="false">sporadic-e ranges at 4,750 miles. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">This was the time frame when the Global D-Region Absorption Predictions (D-RAP) maximum absorption attenuation</div><div dir="ltr" data-setdir="false">reached up to 16 MHz. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">For the rest of the day Es conditions were dampened with higher amounts of skywave background noise.<br></div><div dir="ltr" data-setdir="false"><span><div><br></div></span></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">The distance from my QTH to the volcano is 7652 miles [12314 km] at </span></span>259 degrees azimuth. </div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div dir="ltr" data-setdir="false">If you compare the WWV 10 MHz Doppler Shift Plot chart from January 15th from FN21ei you will notice that the information </div><div dir="ltr" data-setdir="false">above was observed at the nine hour period post eruption, near the middle of the mean reflection points in the ionosphere as </div><div dir="ltr" data-setdir="false">shown on the plot. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Regards,</div><div dir="ltr" data-setdir="false">Mike Schaffer</div><div dir="ltr" data-setdir="false">KA3JAW<br>Easton, PA</div><div dir="ltr" data-setdir="false">FN20jq</div><div dir="ltr" data-setdir="false">GACTVDX</div><div dir="ltr" data-setdir="false"><br></div>
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On Friday, January 21, 2022, 02:04:17 PM EST, Dr. Nathaniel A. Frissell Ph.D. via TangerineSDR <tangerinesdr@lists.tapr.org> wrote:
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<title>Requesting data</title>
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<p class="yiv8683688804MsoNormal">Hi HamSCI,</p>
<p class="yiv8683688804MsoNormal"> </p>
<p class="yiv8683688804MsoNormal">Please see this e-mail from Jim K4BSE below and send him data if you can.</p>
<p class="yiv8683688804MsoNormal"> </p>
<p class="yiv8683688804MsoNormal">Thanks and 73,</p>
<p class="yiv8683688804MsoNormal">Nathaniel W2NAF</p>
<p class="yiv8683688804MsoNormal"> </p>
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<p class="yiv8683688804MsoNormal"><b>From:</b> Jim Farmer <jofarmer@mindspring.com> <br>
<b>Sent:</b> Tuesday, January 18, 2022 4:01 PM<br>
<b>To:</b> Tangerine <tangerinesdr@lists.tapr.org><br>
<b>Subject:</b> Requesting data</p>
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<p class="yiv8683688804MsoNormal"> </p>
<p>On 15 January 2022 those monitoring propagation from standard time stations such as WWV noticed some strange ionospheric phenomena as evidence in the attached plots of 10 MHz WWV signals measured at different locations in the US. See the attached. Each
long page shows the results measured at four locations using grape1 receivers. The first page is for Saturday January 14 and the second page for Sunday January 15. These two pages show the data for four monitoring stations - one was relatively close to WWV.
The red line equals the relative signal strength (right scale) and the black line the frequency deviation (from 10 MHz). This frequency deviation is caused by Doppler shift due to the up-and-down motion of the ionosphere (more specifically, the mean reflection
point in the ionosphere). The green lines are inserted every 5 hours to make comparison easier. Until about 2200 hours on January 14, the plots are pretty much as we normally see. But at about 2200 hours on the 14th, we start seeing some wild perturbations,
which continue into the 15th. What caused them? Well, right now we aren't sure. One thought is that some may have been caused by electromagnetic events due to the Tonga volcano - such events are known to have occurred, but their effect is uncertain right
now. The red vertical line on the second page indicates the time of the volcano's eruption.</p>
<p>We seek more information regarding the state of the ionosphere during this time. If you have grape1 data from these dates, please send the .png and .csv files for these dates produced by the grape1 software, to
<a rel="nofollow noopener noreferrer">jofarmer@mindspring.com</a>. (So long as you put "grape1 data" in the subject line, don't worry if you get a notification that you got caught in my spam filter - I'll see your email and clear it to my inbox.) All data is
appreciated, even if it is not of 10 MHz WWV.</p>
<p>Thanks,</p>
<p>jim</p>
<p> </p>
<p>The following is from my friend W8GNM. Thanks Geoff.</p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;"> Interesting article about the recent explosive eruption of the undersea volcano with photos captured by weather satellites. This is how volcanic islands
are formed.</span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;"> If you can’t view the entire article, check out the twitter links below.</span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;"> 73, Geoff</span><br>
<br>
<a rel="nofollow noopener noreferrer" target="_blank" href="https://www.washingtonpost.com/weather/2022/01/16/hunga-tonga-volcano-tsunami-eruption/">
https://www.washingtonpost.com/weather/2022/01/16/hunga-tonga-volcano-tsunami-eruption/</a></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://twitter.com/i/status/1482280041799385092">https://twitter.com/i/status/1482280041799385092</a></span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://twitter.com/i/status/1482454779456638976">https://twitter.com/i/status/1482454779456638976</a></span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://twitter.com/i/status/1482278417466736651">https://twitter.com/i/status/1482278417466736651</a></span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://twitter.com/i/status/1482436390105272320">https://twitter.com/i/status/1482436390105272320</a></span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://twitter.com/i/status/1482230772929110020">https://twitter.com/i/status/1482230772929110020</a></span></p>
<p style="margin-bottom:12.0pt;" class="yiv8683688804MsoNormal"><span style="color:black;">
<a rel="nofollow noopener noreferrer" target="_blank" href="https://wapo.st/3Fw6EFS">https://wapo.st/3Fw6EFS</a></span></p>
<p class="yiv8683688804MsoNormal"><span style="color:black;"> <a rel="nofollow noopener noreferrer" target="_blank" href="https://www.washingtonpost.com/player/prod/img/video-thumbnail-bg.png">
https://www.washingtonpost.com/player/prod/img/video-thumbnail-bg.png</a></span>
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<pre>-- </pre>
<pre>Jim Farmer, K4BSE</pre>
<pre>Mobile 678-640-0860</pre>
<pre><a rel="nofollow noopener noreferrer" ymailto="mailto:jofarmer@mindspring.com" target="_blank" href="mailto:jofarmer@mindspring.com">jofarmer@mindspring.com</a> (spam blocked)</pre>
<pre>Useless, good-for-nothing retired engineer</pre>
<pre>Member, Fayette County Amateur Radio Club, <a rel="nofollow noopener noreferrer" target="_blank" href="http://www.kk4gq.org">http://www.kk4gq.org</a></pre>
<pre>Volunteer electrical engineer, Smoke Rise Baptist Church <a rel="nofollow noopener noreferrer" target="_blank" href="http://www.smokerisebaptist.org">http://www.smokerisebaptist.org</a></pre>
<pre> </pre>
<pre> Love all, † Follow One</pre>
<pre> </pre>
<pre>"A people that values its privileges above its principles soon loses both."</pre>
<pre> Dwight D. Eisenhower, Inaugural Address, January 20, 1953</pre>
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</div>-- <br>TangerineSDR mailing list<br><a ymailto="mailto:TangerineSDR@lists.tapr.org" href="mailto:TangerineSDR@lists.tapr.org">TangerineSDR@lists.tapr.org</a><br><a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br></div>
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