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

Ursa Astronomical Association

9 observations and 1 comments in queue.

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

Half-sky auroras

18.9.2023 at 22.00 - 01.00 - Rautavaara (IV)
Eero Karvinen

CME again offered quite a spectacle. The cloudiness posed freezing challenges and it was up to the smallest detail so that the whole spectacle would not have been seen. The northern lights were currently spreading across almost the entire sky, offering in addition to green, red and pink hues visible to the eyes. One special feature was the so-called auroral streamer, which on the north side of the oval provided an arc-like stringy area like a substorm. Blue was also visible with the naked eye for a while in this area. In the bottom picture, these blue-toned threads. After the substorm, the sky...

Images: 6 pcs • Comments: 2 pcs

Half-sky auroras

14.9.2023 at 22.00 - 01.30 - Nurmes (IV)
Eero Karvinen

The CME provided a decent avalanche of plasma and gorgeous colors to the sky. The oval was at the zenith and south of it for a large part of the time. During the evening there were several smaller substorms, until around one o'clock the plasma tail finally broke off, providing a corona. No special features could be detected this time, but for a moment a nice omega belt/torch formed in the oval. The special feature of the early evening was a few visible red threads. EMIC and CHORUS waves were visible throughout the evening. Cloudiness was yet another annoyance, but it didn't spoil the s...

Images: 5 pcs

Active aurora band

5.9.2023 at 22.30 - 00.30 - Nurmes (III)
Eero Karvinen

A weak CME provided a small and spectacular substorm during the dark hours of the night. The spiral formed for a while shone surprisingly bright.

Images: 3 pcs • Comments: 1 pcs

Half-sky auroras

3.9.2023 at 01.00 - 03.00 - Nurmes (IV)
Eero Karvinen

A moderately gloomy substorm photographed in the middle of a full moon and light pollution. The substorm in question was probably related to a mass coronal eruption, although according to satellite data, it is a somewhat atypical case. However, the sudden increase in proton density reflects more of a CME than an aperture wind effect. It is also possible that the night's set involved the causes of two typical magnetic storms in a row.

Images: 3 pcs

At least 10 lightning strikes seen

31.8.2023 at 01.30 - 03.30 - Virolahti (III)
Eero Karvinen

The short wave offered a dose of very warm air mass for the time of year. At the same time, a cold front arriving from the southwest assisted in the development of convection. The MCS formed in the Baltics arrived on the southern coast of Finland around 02:00 am. The flash was great, but the low LCL hindered the shooting.

Images: 2 pcs

One halo form

30.8.2023 at 23.40 - 00.20 - Virolahti (I)
Eero Karvinen

22 in the moonlight. Ice crystal clouds originate from the lower parts of withered large-scale thunderclouds.

At least 5 lightning strikes seen

14.8.2023 at 00.00 - 01.30 - Nurmes (II)
Eero Karvinen

Distant flickering of lanterns and live lightning in a small warm sector near the eastern border.

Images: 5 pcs

Arcus cloud

7.8.2023 at 21.00 - 21.30 - Turku (III)
Eero Karvinen

The hottest day of the summer may give way to a cold front accompanied by a thunderstorm. Moments later, a downpour wiped the beautiful colors from the sky.

Images: 2 pcs • Comments: 6 pcs

At least 10 lightning strikes seen

3.8.2023 at 23.00 - 23.30 - Nurmes (III)
Eero Karvinen

Thursday night's rain with convection cells offered a taste of the heat of the southeast air flow. In the picture, a slightly overexposed, apparently negative ground lightning shot in the rain.

Comments: 1 pcs

Image of an exceptional thunder cloud

28.7.2023 at 21.00 - 21.30 - Parainen (III)
Eero Karvinen

A thunderstorm cell over the sea photographed during the Cygnus event. Thunder was mainly cloud lightning. #cygnus2023houtskari

Primary reflection rainbow

18.7.2023 at 21.50 - 22.10 - Nurmes (IV)
Eero Karvinen

A quickly photographed rainbow. The vignetting in the last picture shows well why the optics intended for a body-cell body don't really work with a full-cell, but for documentation, bad vignetting is better than no picture at all. EDIT: added picture no. 4 of the beginning of the play, with a probable reflection rainbow.

Images: 4 pcs • Comments: 2 pcs

Image of an exceptional thunder cloud

29.6.2023 at 17.00 - 19.00 - Nurmes (III)
Eero Karvinen

The day's weather was colored by numerous competing convection cells. In the picture, a few high anvil clouds with faint thunder in the early evening.

Images: 2 pcs

At least 10 lightning strikes seen

21.6.2023 at 16.00 - 17.30 - Nurmes (III)
Eero Karvinen

After a miserable start to the past season, a warm front actively formed lightning cells. The cells merged quickly and a mesoscale convective system (MCS) developed in North Karelia. The system began to take on a ribbon-like shape after crossing my observation location. Attached are pictures from the second half of the narrow part of the strip.

Images: 2 pcs • Comments: 2 pcs

Active aurora band

21.4.2023 at 23.00 - 01.30 - Nurmes (III)
Eero Karvinen

Spring aurora borealis in a weak solar wind situation. The oval was currently rising almost to the zenith and the proton spots delighted with their existence. Otherwise, the usual aurora borealis, but a nice color scheme. The green color was clearly visible and from time to time the upper parts of the strands were colored in reddish tones. Some of the streamers also created pink bottoms for the northern lights.

Images: 4 pcs • Comments: 1 pcs

Active aurora band

18.4.2023 at 23.00 - 01.00 - Nurmes (III)
Eero Karvinen

The mass eruption of the corona allowed us to wait more, but since the polarity was mostly wrong in terms of the aurora borealis, there was no actual explosion in the sky. However, during the dark part of the night, a few very colorful sub-storms formed with red and blue hues. For a moment, red and purple threads were visible to the naked eye in addition to the green.

Images: 4 pcs • Comments: 1 pcs

Quiet aurora band

16.4.2023 at 01.30 - Nurmes (II)
Eero Karvinen

Sar kaari in a weak situation approximately at the zenith.

Active aurora band

13.4.2023 at 23.00 - 01.00 - Nurmes (III)
Eero Karvinen

Again, the colorful aurora borealis typical of the season. The green was visible with my own eyes, the pink lower parts only in the brightest moments of the substorm, and the red upper parts were visible as gray with the eyes, clearly through the camera. After dark, 3 separate substorms formed. I stopped following around 01:00.

Images: 4 pcs

Rocket-related clouds

11.4.2023 at 23.30 - 23.40 - Nurmes (IV)
Eero Karvinen

The launch vehicle's combustion gases, possibly aluminum oxide, glow high in the atmosphere. It is not known what event this is related to. The phenomenon was visible in the southern sky for about 10 minutes. #raketti: Yars-E

Images: 2 pcs • Comments: 5 pcs

Quiet aurora arc

11.4.2023 at 22.30 - 00.50 - Nurmes (II)
Eero Karvinen

Typical for the season, the weak aurora borealis in the dark moment around midnight. The green color was weakly visible with the naked eye at times, the red and blue-refracting shades only with the camera.

Images: 2 pcs

Active aurora band

3.4.2023 at 22.00 - 23.59 - Nurmes (III)
Eero Karvinen

The weak opening wind offered a great little set of substorms. During a couple of hours there were at least 4 clear substorms, where the oval opened like a zipper towards the pole and equatorial position, with bright strands and pink lower parts coloring the sky. Now is also the time of the blue aurora borealis at its best.

Images: 4 pcs

Search result contains observations from time period 1.1.2000 klo 00.00 - 25.9.2023 klo 19.54.