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NLC 2014-07-14/15

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: 2014-07-14/15

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:01  0                                  some cloud bottom left
21:45:01  X                                  some cloud to h 20
22:00:02  X                                  some cloud
22:15:02  X                                  widespread cloud
22:30:03  X                                  widespread cloud
22:45:19  X                                  widespread cloud
23:00:19  0                                  some cloud
23:15:32  0                                  some cloud
23:30:33  NLC         1    3        10   15  patchy cloud
23:45:32  NLC         2    3         0   30  patchy cloud
00:00:47  NLC         3    4       355   30  thin cloud above h 15
00:15:26  II          3    5       355   30  patchy cloud
00:30:25  I,II        4    6       355   30  patchy cloud
00:45:32  I,II        4    7       355   25  patchy cloud above
01:00:32  I           2    8       355  >35  some cloud above
01:15:18  I           2    7       350  >35  cloud above
01:30:10  I           1    8                 through cloud
01:45:10  I           1                      through cloud
02:00:10  I           1                      through cloud
02:15:02  0                                  some cloud patches
02:30:02  0                                  cloud patches to h 5 or 10
02:45:01  0                                  cloud patches to h 5 or 10
03:00:01  0                                  cloud patches to h 5
03:15:01  X                                  some cloud patches

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: 2014/07/14-15
Start: 23:30
End: 02:00
Forms: I,II
Max elevation: 8
Max brightness: 4
Comments:
Some cloud.
<a href="http://www.chiandh.me.uk/nlccam/20140714-15.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:30:33  8.000 348.6 -11.8  -3.1  13.1  0-255 q5573.jpg
23:45:32  8.000 352.1 -12.2  -3.3  11.3  0-255 q5579.jpg
00:00:47 15.000 355.7 -12.4  -3.5  10.4  0-255 q5585.jpg
00:15:26  8.000 359.2 -12.5  -3.5  10.0  0-255 q5590.jpg
00:30:25  8.000   2.8 -12.5  -3.5  10.1  0-255 q5596.jpg
00:45:32  8.000   6.4 -12.3  -3.4  10.8  0-255 q5603.jpg
01:00:32  8.000   9.9 -12.0  -3.2  12.2  0-255 q5609.jpg
01:15:18  4.000  13.4 -11.6  -2.9  14.5  0-255 q5614.jpg
01:30:10  2.000  16.9 -11.0  -2.6  18.8  0-255 q5619.jpg m5619.jpg
01:45:10  2.000  20.4 -10.4  -2.2  27.8  0-255 q5624.jpg m5624.jpg
02:00:10  2.000  23.8  -9.6  -1.6  52.9  0-255 q5628.jpg m5628.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).