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von Timo Kuhmonen
27. Jul 2021, 23:48
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-07-27/28
Antworten: 10
Zugriffe: 447

Re: NLC 2021-07-27/28

FYI; NLC in Taivaanvahti for 27/28 night. The same links shows more observation(s) later on...
https://www.taivaanvahti.fi/observation ... id/desc/0/
von Timo Kuhmonen
27. Jul 2021, 22:26
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-07-27/28
Antworten: 10
Zugriffe: 447

Re: NLC 2021-07-27/28

sample from central Finland this night, north on center at image. My location is at 63Nlatitude... Observing NLC can be exciting (with or without snakes :-)
von Timo Kuhmonen
25. Jul 2021, 11:08
Forum: Meteore
Thema: Fireballs with sonic booms - audio samples?
Antworten: 2
Zugriffe: 232

Re: Fireballs with sonic booms - audio samples?

thanks for comments... That sound sample in Sweden, contains more info than "typical" sound samples :-) I will need to google searching for other samples also (including last night bright fireball near to Oslo & Norway...)
von Timo Kuhmonen
6. Jul 2021, 20:25
Forum: Meteore
Thema: Fireballs with sonic booms - audio samples?
Antworten: 2
Zugriffe: 232

Fireballs with sonic booms - audio samples?

Hello, does someone know here, is there a link list available for fireballs, that have been known to generate clear audible sounds, like distant rumble (similar to thunderstorm) or more loud and sharp sonic booms ? I mean a some kind of list from cases, that include also a recorded sound samples at ...
von Timo Kuhmonen
5. Jul 2021, 19:14
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-07-04/05
Antworten: 53
Zugriffe: 2931

Re: NLC 2021-07-04/05

Seems that there was good NLC's last night, was it the best display for this year in Germany ?

NLC observations in Finland, those still are located on southern Finland (as seen on the map for last night)
https://www.taivaanvahti.fi/observation ... /desc/0/20
von Timo Kuhmonen
30. Jun 2021, 14:45
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-06-29/30
Antworten: 2
Zugriffe: 411

Re: NLC 2021-06-29/30

FYI. Observations in Taivaanvahti (for Finland)
https://www.taivaanvahti.fi/observation ... id/desc/0/
von Timo Kuhmonen
28. Jun 2021, 22:54
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-06-28/29
Antworten: 19
Zugriffe: 1109

Re: NLC 2021-06-28/29

in Taivaanvahti, observations at Finland
Turku, https://www.taivaanvahti.fi/observations/show/99206
Helsinki https://www.taivaanvahti.fi/observations/show/99208

seems all the NLC observations (in Finland) are still centered on southern part of this country...
von Timo Kuhmonen
28. Jun 2021, 12:16
Forum: Off-Topic
Thema: Kitchen optics
Antworten: 1
Zugriffe: 234

Kitchen optics

Couple of weeks ago I collected rhubarb. My purpose was to make a sweet dessert soup. First I cooked a pieces of rhubarb in plain water. When picking up the stainless steel pot cover, soon water started to evaporate. It left these colorful patches on the pot lid. Any ideas, what is root cause for th...
von Timo Kuhmonen
14. Jun 2021, 17:17
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

The other point, where partial solar eclipse should be also visible in Finland today, is the solar cell based home power systems. I quess many of them can track the levels of charging power (in watts) to the large battery packs. Solar radiation power per square meter has decreased during eclipse......
von Timo Kuhmonen
10. Jun 2021, 19:53
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

My own observation image, from central Finland. Image is taken at C8 OTA with 40mm plössl EP, using mobile phone camera (11:16 UTC). Green color is due to Baader solar continuum filter. I could not see clear active regions here, could be due to not perfect camera focusing...
von Timo Kuhmonen
10. Jun 2021, 19:25
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

One question to ask. Is there a known "limit" where even a partial solar eclipse starts to affect measured ambient temperatures? The solar radiation power will be smaller, if large enough of the sun area is blocked by the moon. There is some known power values of sun radiation per square m...
von Timo Kuhmonen
10. Jun 2021, 19:09
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

fyi. For those interested, below is solar eclipse observation from Hankasalmi & Finland, on 10 GHz band (3 meter antenna diameter) https://www.taivaanvahti.fi/observations/show/98861 And other image taken at Rovaniemi & Finland https://www.is.fi/kotimaa/art-2000008045478.html?utm_medium=prom...
von Timo Kuhmonen
10. Jun 2021, 13:38
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

fyi, I managed to follow also solar eclipse (C8 OTA, Baader solar foil, Baader solar continuum filter, 40mm plössl). Visually it was easy to see variations in moon "border", most propably caused by higher mountain peaks. Visually the most suitable was 40mm eyepiece. I did not notice clear ...
von Timo Kuhmonen
9. Jun 2021, 11:08
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

fyi, weather forecast here in central Finland, has clear sky estimates for tomorrow, starting around 12 local time. I try to setup my C8 OTA with tracking mount for solar observation. Has anyone tried LDR to follow ambient light levels ? It would not propably be very precise & scientific :-) but...
von Timo Kuhmonen
5. Jun 2021, 08:18
Forum: Leuchtende Nachtwolken (NLC)
Thema: NLC 2021-06-04/05
Antworten: 12
Zugriffe: 917

Re: NLC 2021-06-04/05

...Simon already posted a link to last night NLC´s on Taivaanvahti... This post can be deleted....
von Timo Kuhmonen
30. Mai 2021, 16:54
Forum: Polarlicht und Astronomie
Thema: Partielle Sonnenfinsternis über Deutschland 10.6.2021
Antworten: 40
Zugriffe: 3371

Re: Partielle Sonnenfinsternis über Deutschland 10.6.2021

I saw Finnish astronomical association (URSA) info of this event. Location where I am now, is on central Finland. Approximately 45% of sun disk is blocked here (see table and "pimennys-%"). In northern Finland the eclipse is a bit deeper. https://www.ursa.fi/pimennys2021.html Based on comm...
von Timo Kuhmonen
29. Mai 2021, 15:28
Forum: Halos und atmosphärische Erscheinungen
Thema: Höhere Regenbogenordnungen, 2021-05-25, Hörlitz
Antworten: 8
Zugriffe: 387

Re: Höhere Regenbogenordnungen, 2021-05-25, Hörlitz

Thanks for reply, good points there... I would also be interested to see linked articles / papers, cannot see those currently due to "payment wall". If I do any test with that narrowband filter (related to rainbows), maybe enhancing the interference bows visibility. The filter that I menti...
von Timo Kuhmonen
28. Mai 2021, 16:42
Forum: Halos und atmosphärische Erscheinungen
Thema: Höhere Regenbogenordnungen, 2021-05-25, Hörlitz
Antworten: 8
Zugriffe: 387

Re: Höhere Regenbogenordnungen, 2021-05-25, Hörlitz

Interesting images :-) Question related to the 5th bow photo attempting... Has there been test(s) whether if green filters would produce any results, for example in the cameras using monocrome sensor ? Based on Les Cowleys site, some of the green band of 5th bow is located between the primary and se...