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NLC 2018-07-06/07

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: 2018-07-06/07

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:01  0                                  clear
22:00:01  0                                  clear
22:15:05  0                                  clear
22:30:02  0                                  clear
22:45:09  0                                  clear
23:00:10  II         1     5        10   25  clear
23:15:19  II         1     5         5   25  clear
23:30:32  II         1     8         0   25  clear
23:45:32  II         1    10         0  >35  clear
00:00:32  II         2    10       355  >35  almost clear
00:15:32  II         2    10       350  >35  almost clear
00:30:32  II         3    10       345   35  almost clear
00:45:31  II         3    10       340   30  almost clear
01:00:32  II         3    10       330   20  almost clear
01:15:09  II         2    10       325   25  almost clear
01:30:02  II         1    10       325   15  almost clear
01:45:03  II         1    10       350  360  almost clear
02:00:02  0                                  clear
02:15:01  0                                  clear
02:30:01  0                                  clear
02:45:01  0                                  clear
03:00:01  0                                  clear

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: 2018/07/06-07
Start: 23:00
End: 01:45
Forms: II
Max elevation: 10
Max brightness: 3
Comments: Almost clear.
http://www.chiandh.eu/nlccam/20180706-07.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

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

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2018/07/06-07
Start: 21:45
End: 22:45
Comments: clear

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2018/07/06-07
Start: 02:00
End: 03:00
Comments: clear

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:00:10  2.000 341.9  -9.8  -1.7  45.0  0-255 q0833.jpg m0833.jpg
23:15:19  4.000 345.4 -10.4  -2.2  28.1  0-255 q0837.jpg m0837.jpg
23:30:32  8.000 349.0 -10.8  -2.5  21.1  0-255 q0842.jpg m0842.jpg
23:45:32  8.000 352.5 -11.2  -2.7  17.6  0-255 q0847.jpg m0847.jpg
00:00:32  8.000 356.0 -11.4  -2.8  15.9  0-255 q0852.jpg m0852.jpg
00:15:32  8.000 359.5 -11.5  -2.9  15.3  0-255 q0857.jpg
00:30:32  8.000   3.0 -11.4  -2.8  15.7  0-255 q0862.jpg
00:45:31  8.000   6.6 -11.2  -2.7  17.0  0-255 q0867.jpg
01:00:32  8.000  10.1 -10.9  -2.5  19.8  0-255 q0872.jpg
01:15:09  2.000  13.5 -10.5  -2.3  25.2  0-255 q0875.jpg
01:30:02  1.000  16.9 -10.0  -1.9  37.2  0-255 q0878.jpg m0878.jpg
01:45:03  1.000  20.4  -9.3  -1.4  70.1  0-255 q0882.jpg m0882.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).