[TangerineSDR] Requesting Grape Data for the Tonga Volcano Event

Dr. Nathaniel A. Frissell Ph.D. nathaniel.frissell at scranton.edu
Wed Jan 19 15:22:32 EST 2022

Hi HamSCI,

Please see this e-mail from Jim K4BSE below and send him data if you can.

Thanks and 73,
Nathaniel W2NAF

From: Jim Farmer <jofarmer at mindspring.com>
Sent: Tuesday, January 18, 2022 4:01 PM
To: Tangerine <tangerinesdr at lists.tapr.org>
Subject: Requesting data

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.

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 jofarmer at mindspring.com.  (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.



The following is from my friend W8GNM.  Thanks Geoff.
    Interesting article about the recent explosive eruption of the undersea volcano with photos captured by weather satellites.  This is how volcanic islands are formed.
    If you can’t view the entire article, check out the twitter links below.
    73, Geoff



Jim Farmer, K4BSE

Mobile 678-640-0860

jofarmer at mindspring.com<mailto:jofarmer at mindspring.com> (spam blocked)

Useless, good-for-nothing retired engineer

Member, Fayette County Amateur Radio Club, http://www.kk4gq.org

Volunteer electrical engineer, Smoke Rise Baptist Church http://www.smokerisebaptist.org

 Love all, † Follow One

"A people that values its privileges above its principles soon loses both."

        Dwight D. Eisenhower, Inaugural Address, January 20, 1953
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