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NLC 2019-06-09/10

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: 2019-06-09/10

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:05  X                                  widespread cloud
22:00:05  X                                  widespread cloud
22:15:06  X                                  widespread cloud
22:30:02  X                                  widespread cloud
22:45:02  X                                  patchy cloud
23:00:10  NLC        4                       through cloud
23:15:18  NLC        4                       through cloud
23:30:19  II         5    20      <325       through cloud
23:45:19  II         5    20      <325  >35  patchy cloud
00:00:32  II         5    20      <325  >35  patchy cloud
00:15:33  II,III     5    20      <325  >35  cloud patches
00:30:32  II,III     5    20      <325  >35  cloud patches
00:45:33  II,III     4    20      <325  >35  cloud patches
01:00:19  II,III     4    20      <325  >35  cloud patches
01:15:18  III,IV     3    25      <325  >35  through cloud
01:30:09  III,IV     3    30      <325  >35  through cloud
01:45:02  NLC        2    30                 through cloud
02:00:07  NLC?       1                       through cloud
02:15:05  X                                  some cloud
02:30:05  X                                  some cloud
02:45:05  X                                  some 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: 2019-06-09/10
Start: 23:00
End: 02:00
Forms: II,III,IV
Max elevation: 30
Max brightness: 5
Comments: through cloud
http://www.chiandh.eu/nlccam/20190609-10.html

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:00:10  2.000 343.2  -9.6  -1.6  51.7  0-255 q7311.jpg
23:15:18  4.000 346.7 -10.2  -2.0  32.3  0-255 q7315.jpg
23:30:19  4.000 350.2 -10.6  -2.3  24.4  0-255 q7319.jpg
23:45:19  4.000 353.7 -10.9  -2.5  20.6  0-255 q7323.jpg
00:00:32  8.000 357.3 -11.0  -2.6  18.8  0-255 q7329.jpg
00:15:33  8.000   0.8 -11.1  -2.6  18.5  0-255 q7334.jpg
00:30:32  8.000   4.3 -11.0  -2.6  19.4  0-255 q7339.jpg
00:45:33  8.000   7.8 -10.8  -2.4  21.9  0-255 q7344.jpg
01:00:19  4.000  11.2 -10.4  -2.2  27.0  0-255 q7347.jpg
01:15:18  4.000  14.7  -9.9  -1.9  38.3  0-255 q7351.jpg
01:30:09  2.000  18.1  -9.4  -1.5  66.7  0-255 q7353.jpg
01:45:02  1.000  21.5  -8.7  -0.9 119.4  0-255 q7355.jpg
02:00:07  1.000  24.9  -7.8  -0.2 150.4  0-255 q7358.jpg m7358.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).