Polarlicht am 05./06.08.2011

 


eher schwacher Polarlichtvorhang; Azimut = Nordhorizont
22:00 UTC   4/29mm  t=13 CMOS-Sensor 800ASA Canon EOS 600D

Hier eine stark nachbearbeitete Version:

 


Teil eines ~Bogens; Azimut = Nordhorizont
22:02:30 UTC   4/29mm  t=13 CMOS-Sensor 800ASA Canon EOS 600D


Mehrere Teile / Wolken eines Bogens unterhalb der schwarzen Linie (darüber = troposphärische Wolken);
Azimut = NNW-NNE, oben links = Großer Wagen
22:11 UTC   4/16mm  t=20 CMOS-Sensor 1600ASA Canon EOS 1100Da
(ursprünglich Farbaufnahme mit falschem Weißabgleich + Astronomik CLS-Filter)


 

Beobachtungsort: Rostock-Nordwest
Koordinaten: ca. 54.1°N / 12.1°E
 
 

Zu den Ursachen dieses Polarlichtes ging aus Berichten der USAF/NOAA u.a. hervor:

Auszüge daraus auf englisch:

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 217 Issued at 2200Z on 05 Aug 2011

...
IIA.  Geophysical Activity Summary 04/2100Z to 05/2100Z:
The geomagnetic field began the period at unsettled levels from
04/2100-05/0300Z.  Quiet levels prevailed until after 1800Z.  From
1800-2100Z, minor to severe storm levels dominated.  Solar wind data
from ACE showed a shock-like feature passing ACE at 04/2105Z which
was followed by a 20 nT sudden impulse at 04/2155Z.  The solar phi
angle showed rotation from negative to positive between 0300-1400Z. 
An additional shock passage was seen at ACE at 1722Z followed by a
noticeable increase in solar wind density, velocity and magnetic
field.  An additional enhancement in the solar wind parameters was
observed at 1834Z which include Bz fluctuation to -20 nT.  Although
the interpretation is not yet certain, timing analysis and model
simulation suggest that the 1722Z & 1834Z enhancements are the first
two of the three expected CME passages.  GOES 15 observed
magnetopause crossings between 1900Z-1915Z and 2000Z-2030Z.  GOES 13
also observed magnetopause crossings between 2000Z-2030Z.  The
greater than 10 MeV proton event that began at 04/0635Z reached a
peak of 83 PFU at 05/1755Z and continues in progress.

IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to reach minor to major storm levels with a chance for
severe storm periods on 06 August.  Heightened activity is expected
due to continued effects from the CMEs of 02, 03, and 04 August. 
Activity is expected to decrease to unsettled to active levels on 07
August.  Quiet to unsettled conditions are expected on 08 August.
...

--------------------------------------------------------------------------------------------------------------------------------------------------------------------

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 218 Issued at 2200Z on 06 Aug 2011

...
IIA.  Geophysical Activity Summary 05/2100Z to 06/2100Z:
The geomagnetic field was at quiet to severe storm levels.  Minor to
severe storm periods were seen from 05/2100Z to 06/0600Z.  The
period started off with solar wind speeds reaching approximately 620
km/s with a total field strength around 28 nT.  The Bz component of
the magnetic field was south around -20 nT for 2 hours before
crossing into a positive region at approximately 05/2211Z.  Solar
wind speed, density, and total magnetic field strength slowly
decreased throughout the period as the effects of the CME passage
began to diminish.  The period ended with a wind speed around 440
km/s and Bt around 5 nT.  The greater than 10 MeV protons above 10
PFU event that began at 04/0635Z, reached a peak flux of 96 PFU at
05/2150Z, and ended at 06/0515Z.

IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to be unsettled to active on 07 August as a recurrent
coronal hole high speed stream is expected to become geoeffective. 
Levels are expected to decrease to quiet to unsettled on 08 August. 
Mostly quiet conditions are expected on 09 August.

...

K-Indices vom 05.08.11:
Tromsø / Norwegen:
 
-
-
-
-
 
-
-
-
-
Niemegk / Deutschland:
4
3
1
1
 
1
3
6
6
K-planetarisch:  3o  2o  0+  0+  0+  3o  7-  8-

K-Indices vom 06.08.11:
Tromsø / Norwegen:
 
-
-
-
-
 
-
-
-
-
Niemegk / Deutschland:
5
4
3
4
 
4
4
1
3
K-planetarisch:
 6+
5o
 4-  4o  
4-
3+
 1+  3o

Kurzbericht:
Beobachtungsbeginn: 21:35UTC / 23:35MESZ
Beobachtungsende: 22:15UTC / 00:15MESZ
Bedingungen: Die Durchsicht war eher mäßig. Die photographischen Bedingungen am Beobachtungsstandort waren aufgrund von Streulicht nicht besonders gut. Die maximale Belichtungszeit wurde dadurch eingeschränkt. Der eher schwachen Erscheinungen waren visuell sichtbar, jedoch ohne Farben. Am markantesten waren einige ~langsam pulsierende Wolken / Teile eines Bogens in etwa 10 - 20° Höhe. Weitwinkelaufnahmen mit f=16 mm glückten aufgrund neuer technischer Ausstattung noch nicht.
 
 

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Photographs and text are copyright ©2011 Olaf SQUARRA

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