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

Ursa Astronomical Association

Sun - 28.5.2021 at 14.32 - 28.5.2021 at 14.33 Tampere Observation number 98580

Visibility III / V

Kari A. Kuure, Tampereen Ursa

During the spring, I have managed to observe the Sun quite often and there has been motivation for it, as comma groups have been visible almost all the time. Most of the observations have, of course, been made from your own yard, as the weather conditions have provided only short moments for making the observations. Fortunately, sightings at the observatory have also been possible, though not quite as often as I would have liked. The picture below is again taken in the yard. The two visible comma groups are swirling out of sight, but by the time they have developed relatively strong flare eruptions, most recently last night.

As can be seen from the technical data, the image is stacked from several still images. At the Sun, stacking may seem strange, as there is plenty of light in the Sun.

The point is that stacking can eliminate the effect of atmospheric turbulence, which is clearly visible in individual images, making the images cleaner and better in resolution. At the same time, image reading noise is reduced inversely proportional to the square root of the number of stacked images. Even if the camera noise is at a good level, reducing it is always a good thing.


Additional information
  • Observation target
    • Sun
    • Keskitaso
Technical information

Camera Nikon Coolpix P950. 25 images from about 45 still images have been stacked in the image. The original still images have been taken as raw files and converted to tif format before stacking. The post-processing is also done in tiffs and the finished image is copied here as a jpg.

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