chi and h site logo

NLC 2018-06-01/02

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: 2018-06-01/02

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:05  X                                  widespread cloud
21:45:05  X                                  widespread cloud
22:00:06  X                                  widespread cloud
22:15:07  X                                  widespread cloud
22:30:10  III        2    25      <325   25  cloud patches
22:45:19  I,III      2    25      <325       some cloud
23:00:32  I          2    20      <325       through cloud
23:15:18  NLC        2                       through cloud
23:30:32  NLC?                               through cloud
23:45:53  II         3    10             30  some cloud
00:00:54  I          3    10       330   30  through cloud
00:15:53  NLC                                through cloud
00:30:53  NLC        3    10       330  >35  some cloud
00:45:53  I,II       2    10            >35  through cloud
01:00:54  I,II       2    10            >35  through cloud
01:15:32  I          1    15                 through cloud
01:30:32  I,II       1    20                 some cloud
01:45:18  II         1    25                 some cloud
02:00:08  II         1    25         0   30  through cloud
02:15:06  X                                  widespread cloud
02:30:06  X                                  widespread cloud
02:45:05  X                                  widespread cloud
03:00:04  X                                  widespread cloud

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: 2018/06/01-02
Start: 22:30
End: 02:00
Forms: I,II,III
Max elevation: 25
Max brightness: 3
Comments: through cloud
http://www.chiandh.eu/nlccam/20180601-02.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:30:10  2.000 336.5  -9.1  -1.2  88.2  0-255 q8586.jpg m8586.jpg
22:45:19  4.000 340.0  -9.9  -1.8  41.3  0-255 q8589.jpg
23:00:32  8.000 343.5 -10.5  -2.3  25.3  0-255 q8593.jpg
23:15:18  4.000 347.0 -11.1  -2.6  18.8  0-127 q8596.jpg
23:30:32  8.000 350.5 -11.5  -2.9  15.4  0-255 q8602.jpg
23:45:53 15.000 354.1 -11.8  -3.0  13.6  0-255 q8608.jpg
00:00:54 15.000 357.7 -11.9  -3.1  12.7  0-255 q8614.jpg
00:15:53 15.000   1.2 -11.9  -3.1  12.6  0-255 q8620.jpg
00:30:53 15.000   4.8 -11.8  -3.1  13.2  0-255 q8626.jpg
00:45:53 15.000   8.3 -11.6  -2.9  14.7  0-255 q8632.jpg
01:00:54 15.000  11.8 -11.2  -2.7  17.5  0-255 q8637.jpg
01:15:32  8.000  15.3 -10.7  -2.4  22.5  0-255 q8641.jpg m8641.jpg
01:30:32  8.000  18.7 -10.1  -2.0  34.0  0-255 q8645.jpg m8645.jpg
01:45:18  4.000  22.1  -9.4  -1.5  65.7  0-255 q8648.jpg m8648.jpg
02:00:08  2.000  25.5  -8.5  -0.8 126.1  0-255 q8650.jpg m8650.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).