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NLC 2018-06-29/30

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 compact camera with limited field of view
          A ~325-35, h ~0-40; images every 15 min
Date: 2018-06-29/30

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:05  X                                  overcast
22:00:05  X                                  overcast
22:15:06  X                                  overcast
22:30:09  X                                  overcast
22:45:10  X                                  overcast
23:00:20  X                                  almost overcast
23:15:19  X                                  almost overcast
23:30:32  X                                  almost overcast
23:45:31  X                                  almost overcast
00:00:32  X                                  cloud to h 10, also above h 20 on left
00:15:33  NLC?       1                       cloud to h 10
00:30:32  I          1    10       335   35  cloud to h 5, also some above h 15
00:45:31  I          1    12       330  >35  cloud to h 5
01:00:32  I          1    12       330  >35  cloud to h 5 and above h 20
01:15:19  I          1    18      <325   25  cloud to h 5
01:30:18  I          1    18      <325   25  cloud to h 5
01:45:08  I          1    35      <325   35  cloud to h 8
02:00:07  I          1    40      <325   30  cloud to h 10, patches above h 40
02:15:02  X                                  almost overcast
02:30:05  X                                  almost overcast
02:45:05  X                                  almost overcast

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: 2018/06/29-30
Start: 00:15
End: 02:00
Forms: I
Max elevation: 40
Max brightness: 1
Comments: Some cloud.
http://www.chiandh.eu/nlccam/20180629-30.shtml

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       NLC: 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)
-------- ------ ----- ----- ----- -----  ----- -------------------
00:15:33  8.000 359.8 -10.9  -2.5  20.4  0-255 q0388.jpg m0388.jpg
00:30:32  8.000   3.3 -10.8  -2.5  21.0  0-255 q0393.jpg m0393.jpg
00:45:31  8.000   6.8 -10.7  -2.3  23.4  0-255 q0398.jpg m0398.jpg
01:00:32  8.000  10.3 -10.3  -2.1  28.5  0-255 q0402.jpg m0402.jpg
01:15:19  4.000  13.7  -9.9  -1.8  39.5  0-255 q0405.jpg m0405.jpg
01:30:18  4.000  17.2  -9.3  -1.4  67.3  0-255 q0408.jpg m0408.jpg
01:45:08  2.000  20.6  -8.7  -0.9 117.7  0-255 q0410.jpg m0410.jpg
02:00:07  1.000  24.0  -7.9  -0.2 149.0  0-255 q0412.jpg m0412.jpg

exp: Exposure time in seconds (200 ISO, f/2.8).
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).