[time-nuts] Re: BOAT

[jeanmichel.friedt at femto-st.fr]

If it can be of any use, I am continuously (as long as no power failure occurs in the lab as
e.g. beginning of this month !) monitoring DCF77 phase code wrt GPS L1 C/A delay from a location 
370 km from Mainflingen since 2016 (see https://hal.archives-ouvertes.fr/hal-02134480/document), 
one measurement every 5 min. 

I can only keep the result of processing (time of flight) and not all raw data for available 
storage limitations.

Attached to this email is a zoom on Oct. 2022. Red is sliding average on 10 samples of blue. 
The raw data are at http://jmfriedt.org/moyenne4, with first column the unix time (s) and the 
second column the DCF77-GPS delay -- I cannot see any obvious impact other than sunrise/sunset
but maybe more clever processing can extract information.

Best, JM

--
JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France

October 23, 2022 2:44 PM, "Michael Gindonis via time-nuts" <time-nuts at lists.febo.com> wrote:

> The burst (or effects) were observed 1320 UTC on the 9th. (First graph in
> the Space weather article from the first mail
> https://spaceweatherarchive.com/2022/10/17/powerful-gamma-ray-burst-made-currents-flow-in-the-earth
> ). I found I needed to read the graph text carefully. On first look, I
> thought I would check data around 2100 UTC.
> 
> I don't have much data logged, but had a quick look and saw nothing
> significant on the 9th. Data I have logged is GPS satellite signal strength
> (from a poorly located GPS module) NTP clock data from the GPS, 4G/LTE
> modem logs.
> 
> Effects observed on Earth were VLF.
> 
> I used to log error data from my DSL modem, DSL lines make a decent VLF
> antenna... It could detect thunderstorms and other VLF interference.
> Unfortunately, my ISP stopped providing DSL to my area last summer so I had
> to move to 4G/LTE. In the absence of other interference, it may have been
> observable in DSL error rates.
> 
> Here is an example from a thunderstorm a couple years ago.
> https://twitter.com/mike011235/status/1278063691141992450
> 
> Best regards...
> 
> ...Mike
> 
> On Sat, Oct 22, 2022 at 1:02 PM Bob kb8tq via time-nuts <
> time-nuts at lists.febo.com> wrote:
> 
>> Hi
>> 
>> My understanding is that the initial burst happened October 8 / 9 (
>> depending on time zone)
>> and that they have been looking at the “ramp down” on the burst ever
>> since.
>> 
>> Based on the chart on the Space Weather site ( and reproductions of the
>> same data elsewhere),
>> the initial burst was pretty impressive. It’s also the sort of thing that
>> simply is impossible to
>> put into a GPS broadcast propagation model. That’s what got me wondering
>> if there had
>> been some sort of effect.
>> 
>> Indeed this would be a lot easier to dig into if the world in general
>> caught word of it a bit
>> sooner. Unfortunately, I only noticed an article about it well after the
>> initial burst happened.
>> 
>> Bob
>> 
>> On Oct 21, 2022, at 11:03 AM, David Taylor via time-nuts <
>> time-nuts at lists.febo.com> wrote:
>> 
>> On 21/10/2022 13:16, Bob kb8tq via time-nuts wrote:
>> Hi
>> Earlier this month a gamma event occurred that now has the name BOAT (
>> Biggest Of All Time ).
>> 
>> https://phys.org/news/2022-10-record-breaking-gamma-ray-possibly-powerful-explosion.html
>> <
>> https://phys.org/news/2022-10-record-breaking-gamma-ray-possibly-powerful-explosion.html
>> 
>> It did have a measured impact on propagation:
>> 
>> https://spaceweatherarchive.com/2022/10/17/powerful-gamma-ray-burst-made-currents-flow-in-the-earth
>> <
>> https://spaceweatherarchive.com/2022/10/17/powerful-gamma-ray-burst-made-currents-flow-in-the-earth
>> 
>> The question is, did it impact GNSS systems and the delivery of time?
>> Was there a “glitch”
>> observed as a result? So far, I have not seen any mention of a timing (
>> or a nav ) issue.
>> Bob
>> 
>> I recall seeing this mentioned at the time, but I didn't see any effects
>> here in Edinburgh - at least according to what my u-blox MAX-M8Q-0-10
>> reported. I keep an eye on SNR and DOP:
>> 
>> https://www.satsignal.eu/mrtg/performance_gps_dop.php
>> 
>> but with the event being a week ago only 2-hour average data now remains.
>> 
>> The Phys.org site doesn't allow a cookie opt-out, which I don't like.
>> 
>> The time is mentioned just as "early in the morning". What time zone
>> might that be? UTC? It gives a date of October 14. Am I misreading that?
>> 
>> The spaceweather site says October-09? At least the time on the graph
>> is in UTC.
>> 
>> Two different events?
>> 
>> Cheers,
>> David
>> --
>> SatSignal Software - Quality software for you
>> Web: https://www.satsignal.eu
>> Email: david-taylor at blueyonder.co.uk
>> Twitter: @gm8arv
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