NLC logbook 2012-2015

I regret to say this, but I have decided to discontinue NLC logbook. Main reason for my decision is lack of time and energy. NLC’s are extremely interesting phenomena and they are well visible from Finland, but because limited resources it is not possible for me to observe and log everything. From now on I will focus my energy and effort to my main astronomy site, Celestial Sphere. I will still occasionally observe and log NLC’s on Celestial Sphere, but any systematic reports are not to be expected.

During the four NLC seasons when I actively observed NLC’s I observed 69 NLC displays! Some of them were really fantastic and unforgettable! I also did 17 negative observations, which makes 86 observations in total!

Thank you for all of you random people who just accidentally stumbled-upon my site! Mayby we will meet on Celestial Sphere again some day!

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Noctilucent clouds 2015

Summer 2015 was not favoirable for me in terms of NLC observing. I have started in a new job, which doesn’t allow me to stay up late during the weeks. Also summer 2015 was very rainy and cloudy (except for two weeks in August, when it was just sunshine and clear skies two weeks in a row). Nevertheless, I was able to make 17 positive and 3 negative observations during the season! In total it makes 20 observations, which is roughly as much as in 2013.

During season 2015 I also observed NLC and aurorae two times in August. It was first time for me to observe these phenomea together! I also observed some very late NLC displays in August. The latest I observed was in the night 16./17.8.2015 which is latest observatin for me ever!

Best and the most interesting NLC nights were:

NLC 2015

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Noctilucent clouds 16./17.8.2015

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)

Brightness of the NLCs: 4 (NLC very bright and attracting the attention of casual observers.)

Elevation: ~2°

Date: 16./17.8.2015
Time: 23:15-23:30 UT
Observing place: Ulvila, Finland
Observing method: Photography, visual
Technical information about photographing equipment: Canon EOS 1100D + Tamron 10-24mm zoom

A small but bright NLC display at very low altitude in northern horizon. Same time with the NLC’s also aurora borealis was observed. This was the last observation in NLC season 2015 for me.

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Noctilucent clouds 15./16.8.2015

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)
  • IVa (Whirls with small angular radius (0.1 – 0.5 degrees))

Brightness of the NLCs: 4 (NLC very bright and attracting the attention of casual observers.)

Elevation: ~2°

Date: 15./16.8.2015
Time: 21:45-23:45 UT
Observing place: Parainen, Finland
Observing method: Photography, visual
Technical information about photographing equipment: Canon EOS 1100D + Tamron 10-24mm zoom

During the night between 15th and 16th of August I drove to Parainen, my dark sky -site near Turku in order to observe deep sky objects visually with my large dobson. When I arrived at the site, a surprising sight was welcoming me in the northern sky, northern lights! This was quite exceptional, as northern lighs aren’t that regular sight in southern part of Finland, and especially not in August!

The display of northern lights was dominated by an aurora arc/band in northern sky. At irregular intervals, the band activated and got a bit brighter, also some fine aurora rays were present with the band! The maximum altitude of the northern lights was about 30 degrees.

The display became even more unusual, when also another phenomenon of high atmosphere appeared in the sky with the northern lights, noctilucent clouds! The NLC’s were at very low altitude in the northern horizon, but they were bright and clearly visible! I cannot remember having observed northern lights together with noctilucent clouds ever bofere this co-appearance of these phenomenae!

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Noctilucent clouds 13./14.8.2015

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)
  • IIIa (Short, straight and narrow streaks)
  • IIIb (Wave-like structure with undulations)
  • IVa (Whirls with small angular radius (0.1 – 0.5 degrees))
  • IVb (Simple curve(s) with angular radius of 3 – 5 degrees.)
  • IVc (Large-scale whirls.)
  • V (A net-like structure)

Brightness of the NLCs: 4 (NLC very bright and attracting the attention of casual observers.)

Elevation: ~5°

Date: 13./14.8.2015
Time: 20:30-23:30 UT
Observing place: Ulvila, Finland
Observing method: Photography, visual
Technical information about photographing equipment: Canon EOS 1100D + Tamron 10-24mm zoom

During this night I observed the NLC’s first time at 20:30 UT, when the NLC’s were still very faint. The NLC’s were visible at very low altitude in NE horizon. I verified my observation with binoculars. During the night, the NLC area grew brighter and larger. The altitude didn’t get higher than 5 degrees. The NLC’s were extending from NNW to NNE. During the night I also observed several perseid -meteors, though I wasn’t able to catch any of them in my photos.

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Noctilucent clouds 8./9.8.2015

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)
  • IIIa (Short, straight and narrow streaks)
  • IIIb (Wave-like structure with undulations)

Brightness of the NLCs: 4 (NLC very bright and attracting the attention of casual observers.)

Elevation: ~80° – 5°

Date: 8./9.8.2015
Time: 20:00-21:30 UT, 00:-00:45 UT
Observing place: Turku, Finland
Observing method: Photography, visual
Technical information about photographing equipment: Canon EOS 1100D + Tamron 10-24mm zoom

Pretty nice NLC display! I observed the NLC’s first time @ 20:oo UT when their altitude was roughly as high as 80 degrees. As the night progressed, the shadow of the Earth was pushing the NLC’s towards the northern horizon. Eventually the NLC’s disappeared roughly between 21:30 UT and 22:00 UT. The NLC’s reappeared in the morning sky, then I observed the NLC’s at low altitude in northeastern sky.

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Noctilucent clouds 24./25.7.2015

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)

Brightness of the NLCs: 3 (NLC clearly visible, standing out sharply against the twilight sky)

Elevation: ~30°

Date: 24./25.7.2015
Time: 21:10-23:00 UT
Observing place: Turku, Finland
Observing method: Photography, visual
Technical information about photographing equipment: Canon EOS 1100D + Tamron 10-24mm zoom

Small, faint and humble NLC display at low altitude extending from north to east.

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