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NLC 2016-07-22/23

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: 2016-07-22/23

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:15:01  0                                  cloud on right
21:30:02  0                                  cloud patches on right
21:45:05  0                                  cloud at right to h 5
22:00:09  0                                  cloud patches at right to h 5
22:15:19  0                                  cloud patches at right
22:30:19  0                                  cloud patches at right to h 5
22:45:32  II         2     4        20       through cloud
23:00:54  II         3     5        10       through cloud
23:15:48  II         4     6         5  >35  through some cloud
23:30:47  II,IV      4     6         0  >35  through some cloud
23:45:47  IV         4     7         0  >35
00:01:24  II,IV      4     8         0  >35
00:15:47  II,IV      5     6        10  >35  some cloud patches above
00:30:47  IV         5     6       350  >35  cloud above
00:45:47  IV         5              15  >35  through cloud
01:00:25  IV         5     8         5  >35  aircraft trail
01:15:26  II,IV      5    10         0  >35  some cloud patches above
01:30:26  II,IV      5    11       345  >35  some cloud patches above
01:45:32  II,IV      5    12       340  >35  some cloud patches above
02:00:18  I,II       5    15       330  >35
02:15:10  II         5    23      <325  >35
02:30:02  I,II       4    35      <325  >35
02:45:02  I,III      3    50      <325  >35
03:00:01  I,III      2   >50      <325  >35
03:15:02  I,III      1
03:30:01  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: 2016/07/22-23
Start: 22:45
End: 03:15
Forms: I,II,III,IV
Max elevation: >50
Max brightness: 5
Comments: http://www.chiandh.eu/nlccam/20160722-23.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:45:32  8.000 337.6 -11.5  -2.9  15.2  0-255 q4904.jpg
23:00:54 15.000 341.2 -12.3  -3.4  11.0  0-255 q4910.jpg
23:15:48 15.000 344.7 -12.9  -3.7   8.7  0-255 q4915.jpg
23:30:47 15.000 348.3 -13.4  -4.0   7.3  0-255 q4921.jpg
23:45:47 15.000 351.9 -13.7  -4.2   6.4  0-255 q4927.jpg
00:01:24 30.000 355.7 -14.0  -4.4   5.9  0-255 q4934.jpg
00:15:47 15.000 359.2 -14.1  -4.4   5.7  0-255 q4939.jpg
00:30:47 15.000   2.8 -14.0  -4.4   5.7  0-255 q4945.jpg
00:45:47 15.000   6.4 -13.9  -4.3   6.1  0-255 q4951.jpg
01:00:25  8.000   9.9 -13.6  -4.1   6.8  0-255 q4956.jpg
01:15:26  8.000  13.5 -13.1  -3.9   7.9  0-255 q4962.jpg
01:30:26  8.000  17.1 -12.6  -3.6   9.7  0-255 q4968.jpg
01:45:32  8.000  20.7 -11.9  -3.1  12.7  0-255 q4975.jpg
02:00:18  4.000  24.1 -11.1  -2.6  18.2  0-255 q4980.jpg
02:15:10  2.000  27.6 -10.2  -2.1  31.3  0-255 q4984.jpg
02:30:02  1.000  30.9  -9.2  -1.3  78.9  0-255 q4987.jpg
02:45:02  0.500  34.3  -8.1  -0.4 144.6  0-255 q4989.jpg
03:00:01  0.250  37.6  -6.8   0.9 163.2  0-255 q4991.jpg
03:15:02  0.067  40.9  -5.5   3.5 170.4  0-255 q4993.jpg m4993.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).