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NLC 2014-06-19/20

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: 2014-06-19/20

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:01  0                                  cloud to h 15 or 20
22:00:01  0                                  cloud to h 15 or 20
22:15:01  NLC?        1                      cloud to h 10 or 15
22:30:02  I           2   35                 cloud to h 10, some higher
22:45:02  I,II        2   40      <325   15  cloud to h 10, some cirrus higher
23:00:08  I,II        3   45      <235   20  cloud patches to h 5
23:15:08  I,II        3   30   8  <325   30  some cloud to h 5
23:30:18  I,II        3   30  10  <325   30  some cloud to h 5
23:45:19  I,IV        3   25  10  <325   20  some cloud patches
00:00:19  I,IV        3                      through cloud
00:15:18  NLC                                through cloud
00:30:10  NLC                                through cloud
00:45:19  X                                  almost overcast
01:00:18  X                                  almost overcast
01:15:10  X                                  almost overcast
01:30:03  X                                  widespread cloud
01:45:02  X                                  widespread cloud
02:00:02  I,IV                               through cloud
02:15:02  NLC?                               through cloud
02:30:05  NLC?                               through cloud
02:45:01  X                                  widespread cloud

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: 2014/06/19-20
Start: 22:15
End: 02:30
Forms: I,II,IV
Max elevation: 45
Max brightness: 3
Comments:
Cloudy 00:45-01:45.
<a href="http://www.chiandh.me.uk/nlccam/20140619-20.shtml">Images</a>.

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:15:01  0.250 332.7  -6.7   1.1 164.1  0-255 q3975.jpg m3975.jpg
22:30:02  0.500 336.0  -7.6   0.0 154.1  0-255 q3977.jpg m3977.jpg
22:45:02  1.000 339.4  -8.4  -0.7 131.9  0-255 q3979.jpg m3979.jpg
23:00:08  2.000 342.8  -9.1  -1.3  86.1  0-255 q3982.jpg
23:15:08  2.000 346.3  -9.7  -1.7  49.4  0-255 q3984.jpg
23:30:18  4.000 349.8 -10.1  -2.0  33.9  0-255 q3988.jpg
23:45:19  4.000 353.3 -10.4  -2.2  27.2  0-255 q3992.jpg
00:00:19  4.000 356.8 -10.6  -2.3  24.2  0-255 q3996.jpg
00:15:18  4.000   0.3 -10.6  -2.3  23.4  0-255 q4000.jpg m4000.jpg
00:30:10  2.000   3.7 -10.6  -2.3  24.5  0-255 q4003.jpg
02:00:02  0.500  24.4  -7.5   0.1 155.6  0-255 q4021.jpg
02:15:02  0.250  27.7  -6.6   1.2 164.9  0-255 q4023.jpg m4023.jpg
02:30:05  0.125  31.0  -5.6   3.3 170.1  0-255 q4026.jpg m4026.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).