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Ursa Astronomical Association

Quiet aurora arc - 27.9.2019 at 22.30 - 27.9.2019 at 23.30 Kemiö Observation number 85874

Visibility II / V

Steve arc

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Additional information
  • Aurora brightness
    • Dim auroras
  • Observed aurora forms
    • STEVE-arc info

      STEVE (Strong Thermal Emission Velocity Enhancement), Pink, radial aurora-like arc  . The STEVE arc is seen clearly separated from the main aurora arc of the northern sky. It forms a long and narrow west-east aligned, usually dim form. It does not belong to traditional auroras as a phenomenon, but may appear same time with them. Occasionally there may also be a green, "toothed" band called ”picket fence” at the bottom of Steve.  

      Riku Talvio, STEVE
      Photo by: Riku Talvio

    • 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.

Comments: 4 pcs
Mikko Peussa - 28.9.2019 at 22.52 Report this

Nätti STEVE. Mistä päin Kemiötä kuvailit, jos saan vähän udella? Vietän itse paljon vapaa-aikaani Kemiössä.

Peter Sjöblom - 29.9.2019 at 10.05 Report this


Olin kuvaamassa Purunpää/Ekhamn:in alueella, paikka puomin takana ,joutuu kävelee perille, jos et ole käynnyt purunpää aluella suosittelen :) .

Peter Sjöblom - 29.9.2019 at 11.30 Report this

jahaa se paikkamerki ei näköjään näy , hamnholman vastapäätä västanland nimelllä olin.pittä kartta hieman zoomata että niimet näkyy


Mikko Peussa - 29.9.2019 at 14.22 Report this

Ok, kiitos! Tuttu paikka kyllä mutta yöaikaan ei ole tullut käytyä.

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