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NLC 2011-06-02/03

BAA report

The report to the BAA Aurora Section gives an overview of the night, which times were cloudy, free of NLC, or with sightings of NLC.

Name of observer: Horst Meyerdierks
Location: Royal Observatory Edinburgh, 55.9N 3.2W
          unattended dSLR with limited field of view A ~325-35, h ~0-40
          images every 15 min
Date: 2011-06-02/03

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:30  0
21:45  0
22:00  0
22:15  0
22:30  0
22:45  0
23:00  I?         1     8
23:15  I          2    10       350   30
23:30  I          3    11       340   30
23:45  I,II       3    11      <330  >30
00:00  II         3    10      <330  >30
00:15  I,II       3    10       330  >30
00:30  II,IV      3    11      <330  >30
00:45  II,IV      3    11      <330  >30
01:00  I,II       3    13      <330  >30
01:15  I,II       3    17      <330  >30
01:30  I          2    19      <330  >30
01:45  I          2    23      <330  >30
02:00  I          1    20
02:15  0
02:30  0
02:45  0
03:00  0

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       NLC: other than or multiple of I-IV
       0: no NLC
       X: no decision possible (mist, cloud etc.)
brightness: 1: very weak
            2: clearly detected
            3: clearly visible
            4: very bright
            5: extremely bright

NLCnet report

The periods of positive sightings of NLC are reported to the NLC Observers' Home Page:

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2011/06/02-03
Start: 23:00
End: 02:00
Forms: I,II,IV
Max elevation: 23
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2011-06-02/03">Images</a>.

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       O: other than or multiple of I-IV
brightness: 1: very weak
            2: clearly detected
            3: clearly visible
            4: very bright
            5: extremely bright

Images

Listed below are the images with positive sightings of NLC. These have been processed merely to adjust the brightness for underexposure. For some, there may also be an unsharp-masked version of the image.

  UT    exp    A    hSun  h15   h85  stretch  image      (masked)
----- ------ ----- ----- ----- -----  ----- ---------------------
23:00  3.200 343.4 -10.4  -2.2  27.2  0-255 q13138.jpg m13138.jpg
23:15  5.000 346.9 -10.9  -2.5  19.8  0-255 q13142.jpg m13142.jpg
23:30  6.000 350.4 -11.4  -2.8  16.1  0-255 q13147.jpg
23:45  8.000 353.9 -11.6  -3.0  14.2  0-255 q13152.jpg
00:00 10.000 357.5 -11.8  -3.1  13.3  0-255 q13157.jpg
00:15  5.000   1.0 -11.8  -3.1  13.1  0-255 q13161.jpg
00:30  5.000   4.5 -11.7  -3.0  13.7  0-255 q13166.jpg
00:45  4.000   8.1 -11.5  -2.9  15.2  0-255 q13171.jpg
01:00  5.000  11.6 -11.1  -2.7  18.0  0-255 q13176.jpg
01:15  4.000  15.1 -10.6  -2.3  23.4  0-255 q13180.jpg
01:30  2.000  18.6 -10.0  -1.9  35.6  0-255 q13183.jpg
01:45  1.300  22.0  -9.3  -1.4  70.3  0-255 q13185.jpg m13185.jpg
02:00  0.600  25.4  -8.5  -0.8 129.7  0-255 q13187.jpg m13187.jpg

exp: Exposure time in seconds (400 ISO, f/3.5).
A: Azimuth of the Sun (degrees).
hSun: Altitude of the Sun (degrees, negative below horizon).
h15: Max. altitude of sunlight at 15 km height (degrees).
h85: Max. altitude of sunlight at 85 km height (degrees).
stretch: Contrast stretch (0-255 means no stretch).