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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

2 observations and 2 comments in queue.

Only observations that have a description and at least one image attached.

At least 10 lightning strikes seen

17.8.2022 at 23.00 - 00.30 - Nurmes (III)
Eero Karvinen

A less common combination. Lightning and northern lights in the same picture. The northern lights themselves do not stand out very well, but they are there. Photographed with two different cameras, one with a wide angle and the other with a 50 millimeter lens.

Images: 4 pcs • Comments: 1 pcs

Bright night shining clouds

12.8.2022 at 00.00 - 02.20 - Nurmes (IV)
Eero Karvinen

For a while I thought about which category, aurora borealis or rare cloud types, but I ended up with illuminating night clouds, since they are remarkably rare compared to aurora borealis. Pictures from Valtimo village.

Images: 4 pcs • Comments: 1 pcs

Bright night shining clouds

10.8.2022 at 00.00 - 01.30 - Nurmes (IV)
Eero Karvinen

Finally, at the height of Nurme, it's dark enough for night clouds to illuminate. The night clouds were weakly visible during the evening, but around midnight the clearing was sudden. Later, upper clouds and other clouds obscured visibility.

At least 5 lightning strikes seen

2.8.2022 at 18.00 - 20.00 - Nurmes (II)
Eero Karvinen

A few trigger flashes seen from the front side of the weak deaf cloud band. Lightning was random along a ribbon-like formation. However, after reaching the top, a typical avalanche cloud developed in the cell formation.

Images: 3 pcs • Comments: 1 pcs

At least 10 lightning strikes seen

12.7.2022 at 22.00 - 01.00 - Nurmes
Eero Karvinen

The hot air mass, thanks to the appropriate instability and the darkening evening, offered a crowd that is difficult to put any better. Arriving along the Pieli, the fire spreader went straight through the open landscape, flashing lightning every couple of seconds. Some of the blows hit the water in the foreground and an even larger part hit the sides on either side of the filming sector. Such an incredible show of lights and a dark summer night is unlikely to be forgotten right away. Below are some pictures of lightning strikes nearby. Photos from the port of Nurme. EDIT: in the pattern pictu...

Images: 6 pcs • Comments: 12 pcs

Image of an exceptional thunder cloud

12.7.2022 at 21.00 - 00.00 - Nurmes (V)
Eero Karvinen

I will add a separate observation about that, e.g. From the thunder cloud that disciplined Nurme and Joensuu. The pictures show the front of the cloud. The core of the cloud itself was about 14 kilometers high and the rumbling was absolutely non-stop. The daughter cells appear as massive mounds above the avalanche cloud.

Images: 6 pcs • Comments: 2 pcs

At least 10 lightning strikes seen

3.7.2022 at 11.00 - 13.00 - Nurmes (IV)
Eero Karvinen

The frontal zone, together with the high moisture in the lower troposphere and the cooled middle troposphere, created a suitable base for thunderstorms. Thunderstorm development started in the morning hours near Kuopio, rapidly intensifying from small cells to MCS. Pictures taken from the observation tower in Ylä-Valtimo. The lightning was mainly cloud lightning, but some really nice ground lightning was recorded on the camera. Shot using a trigger. In the quadrilateral, the cell shortly before the crossing. The development of convection was very fast. EDIT added as an illustration the body fr...

Images: 5 pcs • Comments: 2 pcs

At least 5 lightning strikes seen

15.5.2022 at 12.00 - 13.30 - Nurmes (III)
Eero Karvinen

A few spring raps.

Images: 2 pcs • Comments: 4 pcs

Rare halos

10.5.2022 at 13.50 - 14.00 - Lieto (IV)
Paula Mattila, Eero Karvinen

In Turku, the pyramids, more precisely in the neighboring municipality, because the observation site is Lieto Castle Mountain.

Aurora rays

21.4.2022 at 00.00 - 02.30 - Nurmes (III)
Eero Karvinen

The surprisingly beautiful and seasonally colorful sub-storm happened to hit at just the right time around 0100. The spring sky is already pale from the north, even at the darkest moment. The upper atmosphere is ionized in terms of nitrogen, so the blue color is strongly present.

Images: 4 pcs

Active aurora band

3.4.2022 at 22.30 - 02.00 - Nurmes, Nuolijärvi (III)
Eero Karvinen

Two beautiful northern lights storms with blue northern lights. The blue color is formed by the elastic collision of an electron and a cationic nitrogen molecule. The color blue is typically formed right from the beginning and end of the season due to the composition of the upper atmosphere and sunlight. The red hue is created by the emission of atomic oxygen at 630 nm. Pure blue and red did not stand out, only occasional shades of purple in addition to green.

Images: 4 pcs

Quiet aurora band

31.3.2022 at 22.00 - 01.30 - Nurmes, Valtimo (II)
Eero Karvinen

The corona mass eruption, CME, provided the potential conditions for the end of the season, but the Bz portion of the solar wind magnetic field was strongly positive, nearly 15 nt throughout the evening. Still, a lot of red color, strands created by low-energy electrons, and a diffuse oval formed in the north. The most interesting section was close to the zenith and slightly south of it. A lazy, dim green spotted and partially filamentous area with particles moving slowly west. Strongly reminiscent of a vague picket fence. To the jury on this question whether or not. In the bottom three images...

Images: 5 pcs

Active aurora band

26.3.2022 at 21.45 - 23.59 - Valtimo (III)
Eero Karvinen

An interesting substorm formed as early as the evening hours. The SAR arc was even visible to the naked eye. The spots separated for a moment at the same points as the sarri. Shortly before 10 pm, a pink area resembling discrete northern strands formed between the SAR arc and the diffuse oval, moving from east to west. There is suspicion about STEVE, but it is difficult to prove it. In the bottom image, this pink area is highlighted slightly. #sarg

Images: 6 pcs

Quiet aurora band

22.3.2022 at 22.00 - 23.59 - Nurmes, Valtimo (II)
Eero Karvinen

A small substorm with strands and spots appeared just before midnight.

Images: 3 pcs

Lunar fogbow

14.3.2022 at 02.20 - 02.40 - Valtimo (III)
Eero Karvinen

Chorus waves covered in the spectrum of northern lights in the background of the moon's arch

Images: 2 pcs • Comments: 1 pcs

One halo form

13.3.2022 at 19.30 - 20.30 - Nurmes, Valtimo (I)
Eero Karvinen

A 22-degree halo ring described in a somewhat unusual situation.

Images: 2 pcs • Comments: 3 pcs

Half-sky auroras

13.3.2022 at 19.00 - 02.30 - Nurmes, Valtimo (IV)
Eero Karvinen

The spectacle continues, the Moon went to appear together with the northern lights and cirrus clouds. The halo ring created a unique atmosphere. EDIT morning night storm pictures added. Of note was the very aggressive substorm and Bz receiving values of about -23 nT. During the recovery phase, a stunning chorus wave set was visible. Second in the bottom picture is the flicker of the chorus waves. In the bottom picture, the dune pots are around 1:10 p.m.

Images: 8 pcs • Comments: 1 pcs

Active aurora band

4.3.2022 at 20.00 - 21.00 - Rautavaara (III)
Eero Karvinen

An interesting combination in the evening sky. STEVE and zodiac light have not hit their own place at the same time before. STEVE itself was really dim, only barely visible to my own eyes. The upper part refracted in blue and the lower part glowed in a shade of pink, probably reflecting the emission of nitric oxide at the wavelengths of visible light.

Comments: 2 pcs

Quiet aurora band

22.2.2022 at 23.00 - 02.00 - Rautavaara (II)
Eero Karvinen

The small substorm and the ensuing SAR arc in artillery landscapes is always nice to see. The moonless night made it possible to photograph even the dim northern lights. In the bottom two images, the 630 nm emission of the SAR arc is shown as a line-like region. This indicates the interaction between ring current and plasma pause.

Images: 3 pcs • Comments: 1 pcs

Zodiacal light

3.2.2022 at 18.20 - 18.30 - Valtimo (III)
Eero Karvinen

There is nothing special about zodiac light per se, but in this image I suspect that the camera has succeeded in capturing the blue glow of air in the 415-430 nm range of Herzberg formed by recombination of atomic oxygen. In addition, the reddish and purple refractive hue may be due to a weak SAR arc. Indeed, the main object of the image itself was to describe the SAR arc because moderate CME during the day had supplied a large amount of high energy ions to the ring current region and thus there should be sufficient energy coupling to the ionosphere at an altitude of about 400 km to form a red...

Search result contains observations from time period 1.1.2000 klo 00.00 - 19.8.2022 klo 11.21.