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NLC 2010-06-15/16

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: 2010-06-15/16

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:45  X                                  almost overcast
22:00  X                                  almost overcast
22:15  X                                  cloud in most parts
22:30  X                                  cloud in most parts
22:45  X                                  cloud in most parts
23:00  X                                  cloud in most parts
23:15  X                                  cloud in most parts
23:30  X                                  cloud in most parts
23:45  II          3            325  >15  cloud cover to h 5 and above h 10
00:00  I,II        3   12      ~320  >15  cloud cover below and above
00:15  II          3   13      <320  >15  cloud on horizon and top right
00:30  II,III      3   14      <320  >15  cloud on horizon
00:45  II,III      3   17      <320  >15  cloud on horizon
01:00  II,III      3   19            >15  cloud on horizon
01:15  II,III      2   23                 cloud in front to h 5-12
01:30  NLC         2                      cloud in front
01:45  X                                  cloud in most parts
02:00  X                                  cloud in most parts
02:15  X                                  cloud in most parts
02:30  X                                  cloud patches in most parts
02:45  0                                  cloud to h 7, patches to h 25

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: 2010/06/15-16
Start: 23:45
End: 01:30
Forms: I,II,III
Max elevation: 23
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-15/16>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)
----- ------ ----- ----- ----- -----  ----- ---------------------
23:45  4.000 354.1 -10.8  -2.5  21.1  0-255 q29807.jpg
00:00  4.000 357.6 -11.0  -2.6  19.4  0-255 q29811.jpg
00:15  4.000   1.1 -11.0  -2.6  19.2  0-255 q29815.jpg
00:30  4.000   4.6 -10.9  -2.5  20.3  0-255 q29819.jpg
00:45  4.000   8.1 -10.7  -2.4  23.1  0-255 q29823.jpg
01:00  4.000  11.6 -10.3  -2.1  29.1  0-255 q29827.jpg
01:15  2.000  15.0  -9.8  -1.8  42.7  0-200 q29830.jpg
01:30  2.000  18.5  -9.2  -1.3  77.5  0-255 q29833.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).