chi and h site logo

NLC 2016-08-01/02

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: 2016-08-01/02

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:00:02  0                                  cloud to h 5
21:15:02  0
21:30:07  0
21:45:10  0
22:00:32  0
22:15:53  0
22:30:47  0
22:46:24  0
23:00:47  0
23:16:24  0
23:31:25  0
23:46:24  0
01:01:24  X                                  cloud to h 3
01:15:46  X                                  cloud to h 3
01:30:47  X                                  cloud to h 5
01:46:24  II         1                       cloud to h 3, satellite
02:00:47  IV         2     8            >35  cloud to h 3
02:15:32  IV         3    10       330  >35  cloud to h 3
02:30:32  IV         2    11                 cloud to h 3, some higher
02:45:18  II         2    12                 through cloud
03:00:10  X                                  almost overcast
03:15:07  X                                  almost overcast
03:30:05  X                                  almost overcast
03:45:05  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 absence of NLC are reported to the NLC Observers' Home Page:

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2016/08/01-02
Start: 21:00
End: 23:45
Comments: 

The periods of positive sightings of NLC are reported to the NLC Observers' Home Page:

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2016/08/01-02
Start: 01:45
End: 02:45
Forms: II,IV
Max elevation: 12
Max brightness: 3
Comments: Some cloud.
http://www.chiandh.eu/nlccam/20160801-02.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
01:46:24 30.000  21.4 -14.1  -4.4   5.5  0-255 q6164.jpg m6164.jpg
02:00:47 15.000  24.9 -13.3  -4.0   7.4  0-255 q6169.jpg
02:15:32  8.000  28.4 -12.4  -3.4  10.4  0-255 q6175.jpg
02:30:32  8.000  31.8 -11.4  -2.8  16.2  0-255 q6181.jpg
02:45:18  4.000  35.2 -10.2  -2.1  31.2  0-255 q6185.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).