Active aurora band - 26.9.2020 at 00.00 - 26.9.2020 at 03.00 Oulu, Oulunsalo Observation number 93876

Copyright © 2020 Marko Haapala. All rights reserved.

Visibility III / V

Marko Haapala

9/25/2020 20:00 cycling to the shore of Lake Papinjärvi in Oulunsalo, Oulu, began. The first picture was taken before nine in the evening but it was just a cloudy lake landscape. The night progressed and the clouds worsened but the faith did not end. Before midnight, behind the clouds, the green started to stand out so it went a bit like cloud art when it comes to shooting in terms of northern lights.

Before midnight, the clouds slowly dissipated and activity in the northern lights gradually improved.

The day had time to change so it was already 26.9 on the side and one night was filming. From two at night and beyond, they seem to be the best filmed of the night. The curiosity was a bit of a nuisance and at times a little more, dissipating thankfully for the next show.

The shoreline was allowed to run and walk back and forth diligently and pictures accumulated and overhead the head took the form of a crown, but even better was seen and photographed.

Eventually, at three in the morning, cycling started at home and it took an hour and still had to start the computer and transfer the images to the machine and grind a few to deal with suddenly, which means that at five in the morning I could go to sleep.

The fastest were so fast that the exposure dropped to 0.5 seconds, at the expense of sensitivity, of course, which was no longer over 5,000 points.

The images came to be processed as amusing, perhaps not in the most blatant way now, and a few didn’t have to be processed at all when it was so bright, except of course for noise reduction and a bit of cropping. The sensitivity when it shed was mostly 5,000 and rarely 3,200 but not once 1,600 except perhaps from the very beginning of the night, ie there was enough movement in the sky.

It's 26.9.2020 21:09 now and luckily it's cloudy and rainy because the muscles and back are screaming in pain, again. However, the camera batteries have already been charged, next time.

This description has been automatically translated from Finnish. Click here to see the original text.

2 9

Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- Red coloration of the shapes lower edge
  
  Red lower edge visible with the naked eye. The bands which are starting to level up their activity and are green colored have quite often a narrow red lower edge. This is the most common form of red color which is derived from molecular nitrogen.
  
  Aurora band with purple lower edge. Photo by Ilmo Kemppainen.
  
  The low hanging brightest aurora band is colored red at the lower edge. Photo by Tero Ohranen.
  
  Narrow purple reddish tones at the lower part of this aurora band. Photo by Merja Ruotsalainen.
  
  Purple band at the bottom. Photo by Panu Lahtinen.
- Green auroras
  
  Green, seen with the naked eye, is one the most common colors of the aurora. The green color is derived from atomic oxygen.
  
  Green auroras. Lea Rahtu-Korpela.
  
  Green auroras. Photo by Juha Ojanperä.
- Violet auroras
  
  Usually in Lapland or even in the south you can see purple auroras in stronger aurora shows. The most common color in auroras along with green and red.

Observed aurora forms
- Rays
  
  The raysare parallel to the lines of force of the magnetic field, i.e. quite vertical, usually less than one degree thick light streaks. The rays can occur alone or in connection with other shapes, mainly with arcs and bands. Short rays are usually brightest at the bottom but dim quickly. The longest rays, even extending almost from the horizon to the zenith, are usually uniformly bright and quite calm, and unlike the shorter rays, most often occur in groups of a few rays or alone. Rays, like bands, are a very typical form of aurora.
  
  Artificial light pillars, which are a halo phenomenon visible in ice mist, can sometimes be very similar to the rays of aurora. Confusion is possible especially when the lamps that cause the artificial light pillars are far away and not visible behind buildings or the forest. The nature of the phenomenon is clear at least from the photographs.
  
  Rays. Picture of Tom Eklund.
  
  Rays. Photo by Mika Puurula.
  
  Two beams rise from the aurora veil. Photo by Anssi Mäntylä.
  
  Two radial bands. Show Jani Lauanne.
  
  Radial band and veil. Photo by Jussi Alanenpää.
  
  Two rays. Photo by Aki Taavitsainen.
  
  It may be possible to confuse such rays with artificial light columns. Compare the image below. Picture of Tom Eklund.
  
  There is no aurora in this image, but all the light poles - including the wide and diffuse bar seen at the top left - are artificial light pillars born of ice mist. Photo by Sami Jumppanen.
  
  Aurora and artificial light pillars. All the radial shapes in the picture above are probably artificial light pillars that coincide appropriately with the aurora band. In the image below, the aurora band has shifted and does not overlap with the pillars produced by the orange bulbs. There is no orange in auroras. Photo by Katariina Roiha
- Band
  
  Bands are usually narrower, more twisty at the bottom, brighter, and more active than arches. Bands usually develop from arches.
  
  Bands can form J and U shapes, sometimes even full spirals. The corona can also arise from bands. Bands are a fairly common form of aurora.
  
  Aurora band. Photo by Merja Ruotsalainen.
  
  Aurora band. Photo by Matias Takala.
  
  Aurora band. Photo by Lea Rahtu-Korpela.
  
  Aurora bands. Photo by Lauri Koivuluoma.
  
  Aurora band. Photo by Matias Takala.
- Corona
  
  CoronaA corona is a hand fan shaped structure, it usually forms south of the observer's zenith, most commonly consisting of rays or bands. The corona is usually the most beautiful part of the aurora show. It is bright and active, but on the other hand also short-lived.
  
  Aurora corona. Photo by Anna-Liisa Sarajärvi.
  
  Aurora corona. Photo by Merja Ruotsalainen.
  
  Corona formed from bands. Photo by Markku Ruonala.
  
  Aurora corona. Photo by Tapio Koski.
- Arc
  
  ARC The arcs are wider than the bands and do not fold as strongly. The arcs are normally neither very bright nor active.
  
  The arc is probably the most common form of aurora. When aurora show is a calm arc in the low northern sky it often doesn’t evolve to anything more during night. In more active shows the arc is often the first form to appear and the last to disappear.
  
  The lower edge of the arc is usually sharp but the upper edge can gradually blend into the background sky. As activity increases rays and folds normally develop, and the arcs turn gradually into bands.
  
  An aurora arc runs across the picture. Vertical shapes are rays. Photo by Atacan Ergin.
  
  Aurora Arc. Photo by Mauri Korpi.
  
  Aurora Arc. Photo by Anna-Liisa Sarajärvi.
  
  Aurora Arc. Photo by Matti Asumalahti.

Comments: 2 pcs

Eero Karvinen - 27.9.2020 at 10.23

Hyvin kauniisti näkyy typen emissio pinkkinä kakkoskuvassa.

Pentti Ketola - 27.9.2020 at 14.33

Oikeaan aikaan oikeassa paikassa!

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