NLC 2013-06-02/03

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: 2013-06-02/03

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:01  0
21:45:01  0
22:00:01  0
22:15:02  0                                  some cloud
22:30:02  X                                  widespread cloud
22:45:10  X                                  widespread cloud
23:00:19  X                                  widespread cloud
23:15:18  X                                  cloud patches
23:30:32  I         1     15                 some cloud patches
23:45:32  I         1     10                 some cloud patches
00:00:33  I         1     10       -30   10
00:15:32  I         1     10      <-35   15
00:30:32  I         2     10      <-35   15
00:45:32  I         2     15      <-35   20
01:00:31  I,IV      3     15      <-35   25
01:15:32  I,IV      3     15      <-35   35
01:30:19  I         3     22      <-35  >35
01:45:09  I,IV      3     30      <-35  >35
02:00:02  III,IV    3     40      <-35   25
02:15:01  NLC       2     35       -20    0
02:30:01  0
02:45:01  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: 2013/06/02-03
Start: 23:30
End: 02:15
Forms: I,III,IV
Max elevation:  40
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130602-03.shtml">Images</a>.

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       O: 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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:30:32  8.000 350.5 -11.3  -2.8  16.5  0-255 q3729.jpg m3729.jpg
23:45:32  8.000 354.0 -11.6  -2.9  14.5  0-255 q3734.jpg m3734.jpg
00:00:33  8.000 357.6 -11.7  -3.0  13.6  0-255 q3739.jpg m3739.jpg
00:15:32  8.000   1.1 -11.8  -3.1  13.5  0-255 q3745.jpg m3745.jpg
00:30:32  8.000   4.7 -11.7  -3.0  14.1  0-255 q3751.jpg m3751.jpg
00:45:32  8.000   8.2 -11.4  -2.8  15.7  0-255 q3757.jpg m3757.jpg
01:00:31  8.000  11.7 -11.1  -2.6  18.7  0-255 q3762.jpg
01:15:32  8.000  15.2 -10.6  -2.3  24.6  0-255 q3767.jpg
01:30:19  4.000  18.6 -10.0  -1.9  37.8  0-255 q3770.jpg
01:45:09  2.000  22.0  -9.2  -1.4  75.2  0-255 q3772.jpg
02:00:02  1.000  25.4  -8.4  -0.7 132.5  0-255 q3774.jpg
02:15:01  0.250  28.8  -7.4   0.2 156.7  0-255 q3776.jpg m3776.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).