Die Suche ergab 440 Treffer

von Timo Kuhmonen
1. Mär 2021, 11:59
Forum: Meteore
Thema: 2021-02-26 03:50 UT: Meteor quer durch die Schweiz
Antworten: 14
Zugriffe: 341

Re: 2021-02-26 03:50 UT: Meteor quer durch die Schweiz

nice captures.... Did anyone had recording on at Graves frequency, within higher time resolution...? Interested to see what kind reflections there usually are, especially for the head-echos (doppler change rate per seconds)
von Timo Kuhmonen
28. Feb 2021, 11:41
Forum: Halos und atmosphärische Erscheinungen
Thema: 2021-02-22: Saharastaub
Antworten: 31
Zugriffe: 1523

Re: 2021-02-22: Saharastaub

fyi, In Finland newspapers there was indication of this brownish fine "sand-dust" at 23.2.2021. At least in Laihia & Finland, there has been this type dust on top of snow. Today I also noticed article, from Finnish meteorological Institute FMI. They are asking citizens to send samples....
von Timo Kuhmonen
28. Feb 2021, 11:31
Forum: Test Forum
Thema: chat window test ?
Antworten: 2
Zugriffe: 62

chat window test ?

does it work ok on your browsers now ? I cannot see correctly anymore the old window on top of forum main page- where single lines of posted comments was there from various users?

I use mozilla 86.0 (64bit) browser...
von Timo Kuhmonen
24. Feb 2021, 14:21
Forum: Off-Topic
Thema: Diffraction grating film
Antworten: 0
Zugriffe: 121

Diffraction grating film

hello, is there anyone on this forum, who has used a diffraction grating film ? Did not found a thread on search here... Just picked up letter in the mail, containing small piece of 1000 lines per mm grating. First look it seems almost fully transparent, but it needs to look at an suitable angle. I ...
von Timo Kuhmonen
3. Feb 2021, 21:55
Forum: Polarlicht und Astronomie
Thema: (Sammelthread) Polarlicht-Vorwarnungen 2021
Antworten: 24
Zugriffe: 3465

Re: (Sammelthread) Polarlicht-Vorwarnungen 2021

fyi. Northern light were shown on the timelapse sequence on my meteor camera (WAT 910HX, central Finland). I saw activity SGO magnetograms... Most active forms were on 19:20 UTC today (aurora belt rising up, vertical pillars). Not very bright but as the camera has large pixels, it shows auroras quit...
von Timo Kuhmonen
25. Jan 2021, 23:08
Forum: Polarlicht und Astronomie
Thema: (Sammelthread) Polarlicht-Vorwarnungen 2021
Antworten: 24
Zugriffe: 3465

Re: (Sammelthread) Polarlicht-Vorwarnungen 2021

too bad that the sky is cloudy, in central Finland. Last two hours, there is clearly seen disturbances in magnetic field (SGO magnetogram, Sodankylä, Finland)....
von Timo Kuhmonen
20. Jan 2021, 19:07
Forum: Meteore
Thema: Fireball - Northern Finland & Sweden (2020-12-04)
Antworten: 0
Zugriffe: 257

Fireball - Northern Finland & Sweden (2020-12-04)

FYI. Bright northern Taurid fireball... http://www.radio-science.net/2020/12/fireball-observed-over-northern-finland.html Interesting is here the published analysis of Sodankylä radio data (in addition to video observations). Included 3D measured VHF echoes from plasma trail. Also effects seen on th...
von Timo Kuhmonen
19. Jan 2021, 13:26
Forum: Halos und atmosphärische Erscheinungen
Thema: [Halo] Timelapse video, artificial light halos (Kittilä, Finland)
Antworten: 1
Zugriffe: 185

[Halo] Timelapse video, artificial light halos (Kittilä, Finland)

fyi. Noticed one interesting video, with allsky lens. Video is taken on Kittilä, Finland. Shows clearly the movement of crystals and location of light source(s) on ground...
https://www.taivaanvahti.fi/observations/show/95643
von Timo Kuhmonen
9. Dez 2020, 16:58
Forum: Polarlicht und Astronomie
Thema: (Sammelthread) Polarlicht-Vorwarnungen 2020
Antworten: 40
Zugriffe: 9955

Re: (Sammelthread) Polarlicht-Vorwarnungen 2020

Currently sky is cloudy in central Finland. Also cloudy night hours in local forecast (9th/10th December). Partially cloudy in forecast, but that is in the 5AM tomorrow local time. Does not look good for visual observations here. If auroras are bright enough, it could brighten cloud cover a bit.... ...
von Timo Kuhmonen
5. Dez 2020, 19:29
Forum: Polarlicht und Astronomie
Thema: 25. Sonnenfleckenzyklus beginnt...
Antworten: 44
Zugriffe: 7315

Re: 25. Sonnenfleckenzyklus beginnt...

Question related to sun activity... Has anyone here been following Tamitha Skov on YouTube ? I have found it to be very good source of information. And the things also what happen in the sun at different phases. Many times there is generic lectures, and occasionally very deep ones, like focusing to ...
von Timo Kuhmonen
1. Dez 2020, 19:04
Forum: Off-Topic
Thema: Arecibo radio telescope
Antworten: 2
Zugriffe: 443

Re: Arecibo radio telescope

fyi.Telescope site after last collapse, the movable "pick up antenna" has dropped now on top of reflector... https://www.theguardian.com/world/2020/dec/01/arecibo-radio-telescope-collapses-puerto-rico https://www.noticel.com/galeria/20201201/imagenes-aereas-exclusivas-del-colapso-del-obser...
von Timo Kuhmonen
22. Nov 2020, 16:59
Forum: Off-Topic
Thema: Koivula Meteorite
Antworten: 4
Zugriffe: 692

Re: Koivula Meteorite

thanks for asking :) If I will ever build (or paying someone to build) a house, most propably I will not built a house like this. I do not know how the materials are suitable for four differtent seasons in Finland, in longer time-scale. I mean like 30 years or more... Otherwise it would be nice to v...
von Timo Kuhmonen
22. Nov 2020, 16:48
Forum: Off-Topic
Thema: Arecibo radio telescope
Antworten: 2
Zugriffe: 443

Arecibo radio telescope

fyi, I did not found any other category, so share this here...
https://skyandtelescope.org/astronomy-n ... ismantled/
as mentioned in text, "beyond repair" :(
von Timo Kuhmonen
14. Okt 2020, 08:11
Forum: Halos und atmosphärische Erscheinungen
Thema: Reflection bow (various years, Taivaanvahti)
Antworten: 27
Zugriffe: 4154

Re: Reflection bow (various years, Taivaanvahti)

Well developed reflection bows (pri & sec) -> 13.10.2020 Jyväskylä & Finland
https://www.taivaanvahti.fi/observations/show/94227

another bow -> 10.10.2020 Tornio & Finland
https://www.taivaanvahti.fi/observations/show/94223
von Timo Kuhmonen
28. Sep 2020, 19:04
Forum: Polarlicht und Astronomie
Thema: Northern lights & central Finland 27/28-9-2020
Antworten: 0
Zugriffe: 405

Northern lights & central Finland 27/28-9-2020

Last night was a good one :-) I attach one sample of my images. Got still shutter problems with my old Nikon D200. But managed to get some photos at least. This one is taken at 02:10 local time. Direction to east sky... The display did not have all the brightest auroras. Couple of more brighter auro...
von Timo Kuhmonen
24. Sep 2020, 20:31
Forum: Off-Topic
Thema: Ultrasonic soundscape under nightsky
Antworten: 3
Zugriffe: 972

Re: Ultrasonic soundscape under nightsky

I also checked, and in Audacity you can "transfer" the sounds of bats to frequency range - where it can be heard by human ears. It was a bit similar sound, what is usually heard in bat detector...
von Timo Kuhmonen
24. Sep 2020, 20:28
Forum: Off-Topic
Thema: Ultrasonic soundscape under nightsky
Antworten: 3
Zugriffe: 972

Re: Ultrasonic soundscape under nightsky

thanks for comments. What I have been there is also "social sounds" that bats use, some of them might be under 20kHz ? I remember once entering a barn, to pick up firewood. It happaned approx one month / two months ago. I had mosquitos flying around me. I went indise of barn. Did start to ...