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Aurora in Slovenia

September 26, 2011

Soon after coming into view on the east rim of the Sun, active region 11302 produced a series of strong flares, including an X1.4 flare on 2011 September 22 at 10:50 UTC. While still near the east rim of the Sun, the active region produced an X1.9 flare on 2011 September 24 at 09:40 UTC, followed by the long duration M7.1 flare at 13:20 UTC the same day. The flares produced geoeffective CMEs with speeds approaching 2300 km/s that impacted the Earth on 2011 September 26 with peak solar wind speed around 705 km/s and Bz -31 nT. The impact triggered a G4-class geomagnetic storm with maximum Dst -117 nT. Peak planetary A index was 59. The geomagnetic storm produced low auroral activity visible from Slovenia.

If you also observed the aurora borealis (aka northern lights) from Slovenia, please send a report by e-mail!


Photographs from Rezman Observatory, Slovenia (N46.24, E14.59)
by Javor Kac using 17-mm f/2.8 lens and Canon 40D set to ISO 800

21:12 UT .. 59 s

21:13UT .. 59 s

21:14 UT .. 59 s

21:15 UT .. 59 s

21:16 UT .. 59 s

21:17 UT .. 59 s

21:18 UT .. 59 s

21:20 UT .. 59 s

21:21 UT .. 59 s

21:22 UT .. 59 s

21:23 UT .. 59 s

21:24 UT .. 59 s

21:25 UT .. 59 s

21:26 UT .. 59 s

21:27 UT .. 59 s

21:29 UT .. 59 s


Individual reports
Location: Rezman Observatory (N46.24, E14.59)
UTC Time and Date: 26.09.2011 - 19:35 (2 hours 15 minutes)
Observer: Javor Kac
Limiting magnitude: +6.0
Light pollution: low
Cloudiness: 0%
Limiting magnitude at the location of aurora: ca +5
Auroral activity: very low
Elevation of activity: 15 degrees
Types of activity:
(diffuse glow)
Comments: Aurora first detected photographically through clouds at 19:35 UT. Visually observed from 21:18 to 21:27 UT as faint diffuse glow in central UMa up to 15 degrees high over northern horizon. Detectable on photographs until 21:50 UT.

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