chi and h site logo

NLC 2015-06-11/12

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: 2015-06-11/12

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:45:04  0
22:00:01  0
22:15:05  0
22:30:06  0
22:45:09  0
23:00:09  0
23:15:18  II         2                       some cirrus
23:30:19  I,II       3    12       345   25  some cirrus
23:45:32  I,II       4    12       330   30  some cirrus
00:00:31  I          4    11       330   20  some cirrus
00:15:32  I          3    14       330   15
00:30:31  I,II       3    14       330  >35
00:45:32  I,II       3    15       330  >35
01:00:31  I,II       3    20       330  >35
01:15:19  I,II       3    20       330  >35
01:30:10  I,II       3    23         0  >35
01:45:02  I          1    25         0  >35
02:00:01  I          1    12       350   10
02:15:02  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: 2015/06/11-12
Start: 23:15
End: 02:00
Forms: I,II
Max elevation: 25
Max brightness: 4
Comments: Some cirrus.
http://www.chiandh.eu/nlccam/20150611-12.shtml

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)
-------- ------ ----- ----- ----- -----  ----- -------------------
23:15:18  4.000 346.7 -10.0  -1.9  35.6  0-255 q2292.jpg
23:30:19  4.000 350.2 -10.5  -2.2  26.3  0-255 q2295.jpg
23:45:32  8.000 353.7 -10.8  -2.4  22.0  0-255 q2300.jpg
00:00:31  8.000 357.2 -10.9  -2.5  20.1  0-255 q2304.jpg
00:15:32  8.000   0.7 -11.0  -2.5  19.7  0-255 q2309.jpg
00:30:31  8.000   4.2 -10.9  -2.5  20.7  0-255 q2314.jpg
00:45:32  8.000   7.7 -10.6  -2.3  23.4  0-255 q2319.jpg
01:00:31  8.000  11.2 -10.3  -2.1  29.2  0-255 q2323.jpg
01:15:19  4.000  14.6  -9.8  -1.8  42.1  0-255 q2326.jpg
01:30:10  2.000  18.1  -9.3  -1.4  74.4  0-255 q2328.jpg m2328.jpg
01:45:02  1.000  21.4  -8.5  -0.8 125.4  0-255 q2330.jpg m2330.jpg
02:00:01  0.500  24.8  -7.7  -0.1 152.3  0-255 q2332.jpg m2332.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).