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NLC 2013-08-04/05

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: 2013-08-04/05

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
20:45:01  X                                  widespread cloud
21:00:02  X                                  widespread cloud
21:15:02  X                                  widespread cloud
21:30:10  X                                  widespread cloud
21:45:19  X                                  widespread cloud
22:00:32  NLC?                               through cloud
22:15:47  NLC        1     3         0       through cloud
22:30:47  NLC        1     3         0   10  through cloud
22:45:47  0                                  some cloud
23:00:46  0                                  some cloud
23:15:47  0                                  some cloud
23:30:47  0                                  some cloud
23:46:24  0                                  some cloud
01:01:25  X                                  haze
01:16:24  X                                  haze
01:31:24  NLC        2     4        20   30  through cloud
01:46:24  NLC        2     5        15   25  through cloud
02:01:24  NLC        1                       through cloud
02:16:25  X                                  almost overcast
02:30:53  X                                  almost overcast
02:45:32  X                                  almost overcast
03:00:19  X                                  almost overcast
03:15:08  X                                  almost overcast
03:30:06  X                                  almost overcast
03:45:04  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: 2013/08/04-05
Start: 22:00                         Start: 01:30
End: 22:30                           End: 02:00
Forms: NLC
Max elevation: 3                     Max elevation: 5
Max brightness: 1                    Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130804-05.shtml">Images</a>.
Through cloud.

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:00:32  8.000 326.4 -11.5  -2.9  15.3  0-255 q8863.jpg
22:15:47 15.000 329.9 -12.6  -3.6   9.6  0-255 q8868.jpg m8868.jpg
22:30:47 15.000 333.5 -13.6  -4.2   6.7  0-255 q8874.jpg m8874.jpg
01:31:24 30.000  18.0 -15.5  -5.2   3.1  0-255 q8923.jpg
01:46:24 30.000  21.7 -14.8  -4.8   4.2  0-255 q8929.jpg
02:01:24 30.000  25.3 -14.0  -4.4   5.8  0-255 q8935.jpg m8935.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).