Die Suche ergab 440 Treffer
- 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)
- 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....
- 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...
I use mozilla 86.0 (64bit) browser...
- 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 ...
- 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...
- 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)....
- 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...
- 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
https://www.taivaanvahti.fi/observations/show/95643
- 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.... ...
- 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 ...
- 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...
- 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...
- 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"
https://skyandtelescope.org/astronomy-n ... ismantled/
as mentioned in text, "beyond repair"

- 7. Nov 2020, 14:18
- Forum: Off-Topic
- Thema: Koivula Meteorite
- Antworten: 4
- Zugriffe: 692
- 17. Okt 2020, 11:54
- Forum: Halos und atmosphärische Erscheinungen
- Thema: Multiple order bows / Finland
- Antworten: 24
- Zugriffe: 4846
Re: Multiple order bows / Finland
fyi. Observation from Kouvola, Finland (6.9.2020)
https://www.taivaanvahti.fi/observations/show/94256
https://www.taivaanvahti.fi/observations/show/94256
- 17. Okt 2020, 11:47
- Forum: Halos und atmosphärische Erscheinungen
- Thema: Reflection bow (various years, Taivaanvahti)
- Antworten: 27
- Zugriffe: 4154
Re: Reflection bow (various years, Taivaanvahti)
primary reflection bow, 13.10.2020 Jyväskylä & Finland....
https://www.taivaanvahti.fi/observations/show/94236
https://www.taivaanvahti.fi/observations/show/94236
- 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
https://www.taivaanvahti.fi/observations/show/94227
another bow -> 10.10.2020 Tornio & Finland
https://www.taivaanvahti.fi/observations/show/94223
- 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...
- 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...
- 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 ...