chi and h site logo

NLC 2013-07-08/09

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: 2013-07-08/09

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:04  0                                  cirrus to h 10
21:45:05  0                                  cirrus to h 10
22:00:05  0                                  cirrus to h 10
22:15:06  0                                  cirrus to h 10, some higher
22:30:03  0                                  cirrus to h 10, some higher
22:45:19  0                                  cirrus to h 10, some higher
23:00:19  X                                  cirrus to h 15
23:15:32  X                          cirrus to h 10, NLC-like cirrus to h 20
23:30:53  X                          cirrus to h 10, NLC-like cirrus to h 25
23:45:52  X                          cirrus to h 10, NLC-like cirrus to h 30
00:00:53  X                          cirrus to h 10, NLC-like cirrus to h 25
00:15:53  X                          cirrus to h 10, NLC-like cirrus to h 25
00:30:53  X                          cirrus to h 10, NLC-like cirrus to h 35
00:45:53  X                          cirrus to h 10, NLC-like cirrus to h 35
01:00:52  X                          cirrus to h 10, NLC-like cirrus to h 35
01:15:32  NLC       2     10       -25  +10  through cloud
01:30:18  II        2     12       -30  +25  through cloud
01:45:19  II        2     15      <-35       through cloud
02:00:09  II        2                        through cloud
02:15:06  X                                  cirrus patches
02:30:05  X                                  cirrus patches
02:45:04  0                                  cirrus to h 10
03:00:04  0                                  cirrus to h 10

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: 2013/07/08-09
Start: 01:15
End: 02:00
Forms: II
Max elevation: 15
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130708-09.shtml">Images</a>.
Through cloud. NLC-like cirrus earlier.

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:15:32  8.000 345.3 -10.6  -2.3  24.1  0-255 q6031.jpg
23:30:53 15.000 348.9 -11.1  -2.6  18.5  0-255 q6036.jpg
23:45:52 15.000 352.4 -11.4  -2.8  15.7  0-255 q6041.jpg
00:00:53 15.000 356.0 -11.6  -3.0  14.3  0-255 q6046.jpg
00:15:53 15.000 359.5 -11.7  -3.0  13.7  0-255 q6052.jpg
00:30:53 15.000   3.1 -11.7  -3.0  14.0  0-255 q6058.jpg
00:45:53 15.000   6.6 -11.5  -2.9  15.2  0-255 q6064.jpg
01:00:52 15.000  10.1 -11.2  -2.7  17.5  0-255 q6069.jpg
01:15:32  8.000  13.5 -10.8  -2.4  21.8  0-255 q6073.jpg m6073.jpg
01:30:18  4.000  17.0 -10.2  -2.1  30.8  0-255 q6076.jpg m6076.jpg
01:45:19  4.000  20.4  -9.6  -1.6  54.7  0-255 q6080.jpg m6080.jpg
02:00:09  2.000  23.8  -8.8  -1.0 111.2  0-255 q6082.jpg m6082.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).