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NLC 2010-06-11/12

In addition to the automatic camera, I observed and used a manual camera simultaneously, but in a different location.

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: Stichill Eastfield, 55.7N 2.4W
          unattended dSLR with limited field of view A ~310-20, h ~0-40
          images every 15 min
Date: 2010-06-11/12

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:30  0                                  about 20% overexposed
21:45  0                                  about 10% overexposed
22:00  0                                  about 10% overexposed
22:15  0                                  about 10% overexposed
22:30  0
22:45  0
23:00  0
23:15  I,II        1   15       340    0
23:30  I,II        2   15      ~330   10
23:45  I,III       1   15       335    0  cloud to h 7
00:00  NLC?        1                      cloud to h 8
00:15  IV          1   10   5   338    5
00:30  IV          2   12       345    8
00:45  IV          2   15       345       cloud to h 6
01:00  NLC         2   12       345 >355  cloud to h 10
01:15  NLC         2                      cloud nearby and below
01:30  II,IV       1   13      ~315   ~0  cloud nearby
01:45  IV          1   13      ~340   ~0  cloud to h 7
02:00  0
02:15  0
02:30  0
02:45  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


Name of observer: Horst Meyerdierks
Location: Pearie Law, 55.8N 3.6W
          dSLR with limited field of view A ~325-35, h ~0-40
          images every 15 min
          also naked eye and 9x63 binoculars
Date: 2010-06-11/12

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:30  X                                  cloud patches to h 12
21:45  0                                  few cloud patches to h 15
22:00  0                                  few cloud patches to h 10
22:15  0                                  few cloud patches to h 12
22:30  0                                  few cloud patches to h 10
22:45  X                                  cloud in most parts of field
23:00  II          1    5   4    16   45  some cloud patches
23:15  II          2   15   5   347   45  some cloud patches
23:30  II,IV       2   14       343   45  cloud patches h 15 to 30
23:45  III         1   15       343       few cloud patches above h 30
00:00  IV          1   14   5   347    4  
00:15  I,IV        1   12   4   350  ~20
00:30  I,IV        1   11   6   352  ~20
00:45  III,IV      2   15   6  ~330  ~15  end of watch

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: Stichill
Date: 2010/06/11-12
Start: 23:15
End: 01:45
Forms: I,II,III,IV
Max elevation: 15
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-11/12>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

Name: Horst Meyerdierks
Country: Scotland
Location: Woolfords
Date: 2010/06/11-12
Start: 23:00
End: 00:45
Forms: I,II,III,IV
Max elevation: 15
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-11/12>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.

Stichill Eastfield

  UT    exp    A    hSun  h15   h85  stretch  image      (masked)
----- ------ ----- ----- ----- -----  ----- -------------------------
23:15  4.000 347.3 -10.4  -2.2  27.8  0-255 q29595.jpg m29595.jpg
23:30  8.000 350.8 -10.8  -2.4  21.7  0-255 q29600.jpg m29600.jpg
23:45 10.000 354.3 -11.1  -2.6  18.8  0-255 q29604.jpg m29604.jpg
00:00 10.000 357.8 -11.2  -2.7  17.4  0-255 q29608.jpg m29608.jpg
00:15  8.000   1.3 -11.2  -2.7  17.3  0-255 q29612.jpg m29612.jpg
00:30  4.000   4.8 -11.1  -2.6  18.3  0-200 q29616.jpg m29616.jpg
00:45  4.000   8.3 -10.9  -2.5  20.8  0-200 q29620.jpg m29620.jpg
01:00  6.000  11.8 -10.5  -2.2  25.9  0-255 q29625.jpg
01:15  4.000  15.3 -10.0  -1.9  36.9  0-255 q29628.jpg
01:30  2.500  18.7  -9.4  -1.5  65.8  0-255 q29630.jpg m29630.jpg
01:45  1.300  22.1  -8.6  -0.9 120.5  0-255 q29631.jpg m29631.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).

Pearie Law

  UT    exp  stretch  image      (masked)
----- ------  ----- -------------------------
23:00  5.000  0-255 q15248.jpg m15248.jpg
23:17  5.000  0-255 q15251.jpg m15251.jpg
23:30  8.000  0-255 q15252.jpg m15252.jpg
23:45 10.000  0-255 q15253.jpg m15253.jpg
00:00 10.000  0-255 q15254.jpg m15254.jpg
00:15 13.000  0-255 q15255.jpg m15255.jpg
00:30 10.000  0-255 q15256.jpg m15256.jpg
00:45 10.000  0-255 q15257.jpg m15257.jpg

exp: Exposure time in seconds (200 ISO, f/3.5).
stretch: Contrast stretch (0-255 means no stretch).