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Aurora in Slovenia August 5, 2011
This was the first auroral display of Solar cycle 24 visible from Slovenia. On 2011 August 4 at 03:57 UTC active region 11263 produced an M9.3 flare followed by a fast full-halo CME (1950 km/s). The CME impacted the Earth late on 2011 August 5 with peak solar wind speed around 620 km/s and Bz -20 nT. The impact triggered a G4-class geomagnetic storm with maximum Dst -117 nT (-86 nT at the beginning of observations). Peak planetary A index was 50. 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 Ribniska koca, Slovenia (N46.50, E15.26)
by Javor Kac using 17-mm f/2.8 lens and Canon 40D set to ISO 800
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22:00 UT .. 59 s
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22:02 UT .. 59 s
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22:07 UT .. 59 s
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22:14 UT .. 59 s
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22:28 UT .. 59 s
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22:59 UT .. 59 s
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23:17 UT .. 59 s
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01:18 UT .. 59 s
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01:39 UT .. 59 s
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01:50 UT .. 59 s
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Individual reports
Location: Ribniska koca (46.50N, 15.26E)
UTC Time and Date: 05.08.2011 - 21:52 (3 hours)
Observer: Javor Kac
Limiting magnitude: +6.5
Light pollution: low
Cloudiness: 20%
Limiting magnitude at the location of aurora: ca +6
Auroral activity: very low
Elevation of activity: 25 degrees
Types of activity:
(diffuse glow)
Comments: Aurora first detected photographically
through clouds at 21:52 UT. Visually observed from
22:07 UT to 22:30 UT as faint reddish diffuse glow
up to 20 degrees high and spanning 40 degrees in
azimuth.
Location: Ribniska koca (46.50N, 15.26E)
UTC Time and Date: 05.08.2011 -
Observer: Jure Atanackov
Limiting magnitude: +6.9
Light pollution: very low
Cloudiness: 20%
Limiting magnitude at the location of aurora: +6.5
Auroral activity: very low
Elevation of activity: 30 degrees
Types of activity:
(diffuse glow)
Comments: Aurora first detected photographically.
Visible as faint white to reddish glow up to 30 degrees
high. Clouds low on the N horizon, up to 25 degrees
high obscured the lower part of auroral activity.
The text on this page is © 2011 by MBK Team.
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