AKM e.V. Forum

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...

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...

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...

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 ...

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...

...Simon already posted a link to last night NLC´s on Taivaanvahti... This post can be deleted....

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...

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...

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...

FYI. on beginning of this week, there was couple of days with lot warmer conditions at Finland. Some places more than +25C temperatures. I also made some tests with my Zoom H5 recorder, for capturing environment sounds. That is because I get basic info of a recording, in case I later put on a perman...

Colorful reflections on water, 14.5.2021 - Pälkäne, Finland
https://www.taivaanvahti.fi/observations/show/98384

fyi,

some addional data presented on Juha Vierinen YouTube channel from this case. At end of video, there is mentioned scientific paper coming out for study this case (no schedule published yet...)
https://www.youtube.com/watch?v=6pYSFzfGjMI

fyi. Another observation from Helsinki / Finland at 29.4.2021.
https://www.taivaanvahti.fi/observations/show/98055

M20210419_213857_+P.jpg fyi, little bit of aurora activity right now, on central Finland. Watec meteor cameras could see band on low northern sky. Just came also outside, visually confirmed. The band (approx 15 degrees height) is weak and diffuse. No moving forms of aurora seen. Moonlight is reduci...

fyi, This is the case where I posted links on the Zoom session at 14.4.2021. I put these also on forum, if someone is interested :-) From this case there is now six observations https://www.taivaanvahti.fi/observations/browse/pics/3826760/observation_id/desc/0/20 Same observations on map https://www...

fyi, observing auroras on central Finland this night. I saw one "set" of auroras on northern sky, between 21:40...21:50 UTC. Those were not the strongest here visually. Maybe too weak ones, so that it could be seen -or photographed- on central europe ?

another one from Rovaniemi / Finland at 18.3.2021 --> 28° ring halo [Scheiner]
https://www.taivaanvahti.fi/observations/show/96861

FYI. Pyramid surface halos, Rovaniemi & Finland (16.2.2021)
https://www.taivaanvahti.fi/observations/show/96836

fyi, couple of other STEVE's in Taivaanvahti, for 2nd March 2021... https://www.taivaanvahti.fi/observations/show/96401 https://www.taivaanvahti.fi/observations/show/96411 https://www.taivaanvahti.fi/observations/show/96402 The map looks interesting, propably need to look text more pricisely... EDIT...

fyi,

today around 19:49 UTC, in central Finland I saw auroras moving at northern low sky (Watec 910). Looks like the same time a bit of drop in magnetic field values (at SGO magnetogram)....