chi and h site logo

NLC 2014-07-07/08

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: 2014-07-07/08

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:02  0                                  cloud to h 10
22:00:05  0                                  cloud to h 10
22:15:05  0                                  cloud to h 10
22:30:02  IV          2    9       350   10  cloud to h 5
22:45:09  I,IV        3   10       350   15  cloud patches
23:00:18  IV          3   14             35  thick cirrus below and on left
23:15:32  I,IV        3   15             30  through cirrus
23:30:32  NLC         1                      through cloud
23:45:32  NLC         3                      through cloud
00:00:32  I,II        2                      through cloud
00:15:32  I,IV        4                      through cloud
00:30:32  NLC         3                      through cloud
00:45:32  NLC         3                      through cloud
01:00:19  NLC         3                      through cloud
01:15:32  NLC         3                      through cloud
01:30:19  NLC                                through cloud
01:45:19  X                                  widespread cloud
02:00:10  X                                  widespread cloud
02:15:08  X                                  widespread cloud
02:30:05  X                                  widespread cloud
02:45:05  X                                  almost overcast
03:00:05  X                                  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 positive sightings of NLC are reported to the NLC Observers' Home Page:

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2014/07/07-08
Start: 22:30
End: 01:30
Forms: I,II,IV
Max elevation: 15
Max brightness: 4
Comments:
Through cloud.
<a href="http://www.chiandh.me.uk/nlccam/20140707-08.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

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  1.000 335.0  -8.3  -0.6 136.6  0-255 q4974.jpg
22:45:09  2.000 338.4  -9.1  -1.3  83.0  0-255 q4977.jpg
23:00:18  4.000 341.9  -9.9  -1.8  41.2  0-255 q4980.jpg
23:15:32  8.000 345.4 -10.5  -2.2  26.3  0-255 q4984.jpg
23:30:32  8.000 348.9 -10.9  -2.5  20.0  0-255 q4988.jpg
23:45:32  8.000 352.4 -11.3  -2.8  16.8  0-255 q4993.jpg
00:00:32  8.000 355.9 -11.5  -2.9  15.2  0-255 q4998.jpg
00:15:32  8.000 359.5 -11.6  -2.9  14.6  0-255 q5003.jpg
00:30:32  8.000   3.0 -11.5  -2.9  14.9  0-255 q5008.jpg
00:45:32  8.000   6.5 -11.4  -2.8  16.2  0-255 q5013.jpg
01:00:19  4.000  10.0 -11.1  -2.6  18.7  0-255 q5017.jpg
01:15:32  8.000  13.6 -10.6  -2.3  23.7  0-255 q5023.jpg
01:30:19  4.000  17.0 -10.1  -2.0  34.4  0-255 q5026.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).