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Skywarden,
Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Other storm phenomenon - 15.1.2022 at 20.13 - 16.1.2022 at 04.55 Orimattila, Artjärvi, Viestikallio Observation number 103917

Visibility I / V

Jorma Ryske, Etelä-Suomen kosmol. seura

The pressure wave of the volcanic eruption in Tonga is shown in the graph of the pressure gauge of the Artjärvi Viestikallio (60.73N, 26.21E) weather station. The first pressure wave reached Viestikallio weather station on January 15, 2022, maximizing at about 20:13 EET / 18:13 UTC, and the second inverse-looking pressure wave on January 16, 2022 at about 04:55 EET / 02:55 UTC. #TongaVolcano .

The observation category "Storm Phenomenon" should be interpreted a bit broadly in this observation :-)



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Technical information

Weather station Cotech FT020, FT-0205. The barometric pressure gauge has not been calibrated, so the measured values are not absolute.

Comments: 5 pcs
Timo Kantola - 16.1.2022 at 15.36 Report this

Tästä tapahtumasta Scott Manleyn loistava esitys Y-tubessa:

Volcanic Eruption May Be Biggest Ever Seen From Space

https://www.youtube.com/watch?v=zoMRwyNhqJ4

Timo Kuhmonen - 16.1.2022 at 15.49 Report this

Mielenkiintoista... Vesannolla on minulla yleiseen sääreurantaan ollut pari BlueAstro USB säätikkua. Sielläkin pari "nököä" näkyy käyrällä. Ovat ilmanpaine käyrälle tallentuneet, vaikka ilmeisesti ei SQL tietokantaan asti data päädy, win10 asennuksen ongelmien  jälkeen. Kaivan nuo esille ja voisin tehdä erillisen havainnon, jos ajat täsmää...

Elmar Schmidt - 16.1.2022 at 17.10 Report this

Interesting. A friend opf mine caught the first explosion's pressure wave both ways around the globe, see here 

https://forum.meteoros.de/viewtopic.php?f=2&p=237034#p237033

What about the signal at 4:55: was it from a second eruption at Tonga? 

Jorma Ryske - 16.1.2022 at 18.01 Report this

Yes, that's very probably the case here, also according to some twitter discussions ( https://twitter.com/mikarantane/ ) the second shockwave has round the earth at opposite direction, ie the first shockwave came to Finland shorter route from about north and second shockwave longer route from about south. Timings between Germany and Finland can be quite different because of different distances to Tonga. In this graph is visible also smaller anomaly at 01:50EET/23:50UTC, not sure if it's related to this at all.

Elmar Schmidt - 16.1.2022 at 18.23 Report this

Okay, thanks! I checked the distances from Tonga to Artjärvi, which are 10 000 km different between both ways. This leads to an estimated delay of 9:04 for the longer path, which is consistent with the recording. So no second explosion signature so far, probably.

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