Die Suche ergab 430 Treffer

von Timo Kuhmonen
1. Dez 2020, 19:04
Forum: Off-Topic
Thema: Arecibo radio telescope
Antworten: 2
Zugriffe: 195

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-observatorio-de...
von Timo Kuhmonen
22. Nov 2020, 16:59
Forum: Off-Topic
Thema: Koivula Meteorite
Antworten: 4
Zugriffe: 485

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: 195

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: 3731

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: 312

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: 793

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: 793

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 hear occas...
von Timo Kuhmonen
14. Sep 2020, 18:26
Forum: Halos und atmosphärische Erscheinungen
Thema: Multiple order bows / Finland
Antworten: 24
Zugriffe: 4556

Re: Multiple order bows / Finland

Juva / Finland, 11.9.2020 -> 3rd and 4th order bows. Scroll down the page to see image...
https://www.taivaanvahti.fi/observations/show/93585
von Timo Kuhmonen
10. Sep 2020, 19:21
Forum: Meteore
Thema: Long duration fireball (Finland, 7.9.2020)
Antworten: 12
Zugriffe: 981

Re: Long duration fireball (Finland, 7.9.2020)

timestamp that is visible on Taivaanvahti observation title (together with date), that is current local time. Now it is UTC+3h (summertime). If there is timelabel on images, on most cases it is UTC time (not 100% still). This case was seen at 20:03 UTC.
von Timo Kuhmonen
10. Sep 2020, 14:47
Forum: Off-Topic
Thema: Ultrasonic soundscape under nightsky
Antworten: 3
Zugriffe: 793

Ultrasonic soundscape under nightsky

just wondering, has anyone observed this ? I have not visited yet in Germany, I assume you still have more distant areas, that have less human created noises ? here is two samples of flying mammals sounds :-) http://timokuhmonen.kuvat.fi/audio/spectrograms/2020-08-20_zoom-H5_audio0002_spectrogram001...
von Timo Kuhmonen
10. Sep 2020, 14:26
Forum: Halos und atmosphärische Erscheinungen
Thema: Multiple order bows / Finland
Antworten: 24
Zugriffe: 4556

Re: Multiple order bows / Finland

Lieto / Finland at 6.9.2020 (both 3rd and 4th order bows) https://www.taivaanvahti.fi/observations/show/93429 Elmar, if referring third image in this observation, how did you see traces of possible (?) 5th order... I tried to increase heavily saturation and also put strong USM sharpening at GIMP. (...
von Timo Kuhmonen
10. Sep 2020, 14:11
Forum: Meteore
Thema: Long duration fireball (Finland, 7.9.2020)
Antworten: 12
Zugriffe: 981

Re: Long duration fireball (Finland, 7.9.2020)

Okay...some crude calculations from the limited image data available: hello, Did you make the analysis, with common known equations, or do you have a specific software or tools ? I know there is already more precise analysis done here in Finland. That data is currently available to only members of ...
von Timo Kuhmonen
9. Sep 2020, 11:52
Forum: Meteore
Thema: Long duration fireball (Finland, 7.9.2020)
Antworten: 12
Zugriffe: 981

Long duration fireball (Finland, 7.9.2020)

Observation from 7.9.2020, fireball duration 20+ seconds... https://www.taivaanvahti.fi/observations/show/93504 https://www.taivaanvahti.fi/observations/show/93529 https://www.taivaanvahti.fi/observations/show/93517 All observations from same event here... https://www.taivaanvahti.fi/observations/br...
von Timo Kuhmonen
9. Sep 2020, 11:42
Forum: Halos und atmosphärische Erscheinungen
Thema: Reflection bow (various years, Taivaanvahti)
Antworten: 27
Zugriffe: 3731

Re: Reflection bow (various years, Taivaanvahti)

Elmar Schmidt hat geschrieben:
9. Sep 2020, 06:34
The third image seems to show a trace of the 5th order, too.

Elmar
link to observation...?
von Timo Kuhmonen
8. Sep 2020, 20:00
Forum: Halos und atmosphärische Erscheinungen
Thema: Reflection bow (various years, Taivaanvahti)
Antworten: 27
Zugriffe: 3731

Re: Reflection bow (various years, Taivaanvahti)

Observation from Kurenpolvi, Finland (31.8.2020). There is only a small fragment visible (primary reflection bow) https://www.taivaanvahti.fi/observations/show/93277 fyi. I forgot to mention, that this observation has also weak secondary reflection bow (in addition to primary reflection bow). There...