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Ursa Astronomical Association

Auroras seen through breaks in the clouds - 12.10.2021 at 13.00 - 12.10.2021 at 23.59 Vesanto Observation number 101777

Visibility III / V

Timo Kuhmonen, Ursa (Etelä-Suomi)

During the evening, as early as 6 pm, thick mist began to accumulate on the shallow earth in many places. As the sky darkened, it obscured visibility in many places. After ten, I saw some narrow arc in the sky through the mist. It was close to the Milky Way, that is, almost in the zenith. The camera when I went inside to retrieve it was no longer visible. However, one image was captured by the glow of repos through the clouds. The attached fisheye photograph was taken at 22:52 local time. Not all forms of northern lights could be properly identified through the cloud


EDIT1: Supplement for radio observations (50MHz radio aura propagation). There were a lot of radio beacons heard through the Aurora progression on October 12, 2021.

-OH9SIX (50,417) Aurora's progress began on October 12, 2021, at 10:50 UT (marker 1) and ends at 13:50 UT (marker 2)
-OH9SIX (50,417) Aurora's progression again on October 12, 2021, at 3:50 PM UT (marker 3)
-other frequencies will emerge, the so-called southern lighthouses:
50.468 (SK3SIX, Sweden, Östersund) rises from 13:30 UT (marker 4)
50.4548 (LA8SIX, Norway near Oslo) rising from 2pm UT (marker 5)
50,460 (SA1CKI, Visby, Gotland) rising from 2pm UT (marker 6)
50,471 (OZ7IGY, Jystrup, Denmark) rises from 14:45 PM UT (marker 7)
-Southern southern lighthouses will disappear via Aurora at about 3:30 pm ... 4:00 pm UT
-OH9SIX (50,417) signal to be heard again on October 13, 2021, at 00 ... 01 UT

It was mind-boggling to follow the activity. It is likely that the area reflecting the radio signals (Aurora backscatter) has moved clearly to the south. There is a small question mark in the beacons' identification, you should reasonably be correct :-) The receiving antenna is pointed north, probably picked up some reflections from the side beam during the observations. As long as the next similar activity (or more intense) becomes, it will be interesting to make comparisons.

More similar observations
Additional information
  • Aurora brightness
    • Bright auroras
  • Observed aurora forms
    • Arc info

      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.

    • Band info

      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.

  • Colors with unaided eye and other features
    • Green auroras info

      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.

Technical information

Equipment: Nikon D200, Sigma 4.5 / 2.8, Manfrotto tripod

Radio observations: Diamond A502HBR yagi, Ettus B100 receiver, HDSDR

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