NLC 2015-07-05/06

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: 2015-07-05/06

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:01  X
22:00:01  X
22:15:01  X
22:30:01  X
22:45:03  X
23:00:10  X
23:15:19  X
23:30:19  X
23:45:18  I          1    10      <325  340  through cloud
00:00:33  I          2    10      <325  340
00:15:32  I          2    10      <325  350  through cloud
00:30:19  I,IV       3    15       325   30
00:45:20  I,II       2    12      <325   30  through cloud
01:00:19  IV         3    12      <325   30  cloud below
01:15:18  I          2    15      <325   15
01:30:10  I          2    15      <325   30
01:45:03  I          1    20       325   10
02:00:02  I          1    20
02:15:02  0
02:30:01  0
02:45:01  0
03:00:01  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: 2015/07/05-06
Start: 23:45
End: 02:00
Forms: I,II,IV
Max elevation: 20
Max brightness: 3
Comments: Some cloud.
http://www.chiandh.eu/nlccam/20150705-06.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:45:18  4.000 352.5 -11.0  -2.6  18.8  0-255 q3756.jpg m3756.jpg
00:00:33  8.000 356.0 -11.3  -2.7  16.9  0-255 q3762.jpg
00:15:32  8.000 359.6 -11.3  -2.8  16.3  0-255 q3767.jpg
00:30:19  4.000   3.0 -11.3  -2.8  16.6  0-150 q3771.jpg
00:45:20  4.000   6.6 -11.1  -2.7  18.1  0-200 q3776.jpg
01:00:19  4.000  10.1 -10.8  -2.5  21.3  0-150 q3781.jpg
01:15:18  4.000  13.6 -10.4  -2.2  27.6  0-255 q3786.jpg
01:30:10  2.000  17.0  -9.8  -1.8  42.0  0-255 q3789.jpg
01:45:03  1.000  20.4  -9.2  -1.3  80.5  0-255 q3791.jpg m3791.jpg
02:00:02  1.000  23.8  -8.4  -0.7 133.3  0-255 q3794.jpg m3794.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).