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NLC 2014-07-10/11

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: 2014-07-10/11

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:01  X                                  almost overcast
21:45:05  X                                  widespread patchy cloud
22:00:02  0                                  cloud to h 10
22:15:02  0                                  cloud to h 10
22:30:02  IV?                                cloud to h 10, moonlit contrail?
22:45:19  IV?     cloud to h 10, moonlit contrail?, bright spot above Arcturus
23:00:32  IV?                                cloud to h 5, two moonlit contrails?
23:15:31  IV?                                cloud to h 5, two moonlit contrails?
23:30:53  IV          1                      cloud to h 5, two "contrails"
23:45:32  IV          2                      cloud to h 5, one "contrail"
00:00:32  IV          3    8                 cloud to h 5, one "contrail"
00:15:32  IV          3    8                 cloud to h 5
00:30:32  IV          2    9                 cloud to h 5
00:45:32  NLC         1   10                 cloud to h 5
01:00:31  0                                  cloud to h 5
01:15:19  0                                  cloud to h 5
01:30:19  0                                  cloud to h 5
01:45:10  0                                  cloud to h 5
02:00:10  0
02:15:01  0
02:30:05  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: 2014/07/10-11
Start: 22:30
End: 00:45
Forms: IV
Max elevation: 10
Max brightness: 3
Comments:
Through cloud.
<a href="http://www.chiandh.me.uk/nlccam/20140710-11.shtml">Images</a>.

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

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2014/07/10-11
Start: 01:00
End: 03:00
Comments: 

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:30:02  1.000 334.8  -8.6  -0.9 120.9  0-255 q5210.jpg m5210.jpg
22:45:19  4.000 338.3  -9.5  -1.5  59.0  0-255 q5214.jpg m5214.jpg
23:00:32  8.000 341.8 -10.2  -2.1  31.2  0-255 q5218.jpg
23:15:31  8.000 345.2 -10.8  -2.5  21.4  0-255 q5222.jpg m5222.jpg
23:30:53 15.000 348.8 -11.3  -2.8  16.7  0-255 q5228.jpg m5228.jpg
23:45:32  8.000 352.3 -11.6  -3.0  14.3  0-255 q5232.jpg m5232.jpg
00:00:32  8.000 355.8 -11.8  -3.1  13.0  0-255 q5238.jpg
00:15:32  8.000 359.4 -11.9  -3.2  12.5  0-255 q5244.jpg
00:30:32  8.000   2.9 -11.9  -3.1  12.7  0-255 q5250.jpg
00:45:32  8.000   6.5 -11.7  -3.0  13.7  0-255 q5256.jpg m5256.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).