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NLC 2013-07-14/15

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: 2013-07-14/15

   UT     forms  bright   height   azimuth   comments
                  ness   top bot  left rght  e.g. weather
--------  -----  ------  --- ---  ---- ----  --------------------------------
21:30:01  0                                  cloud to h 5
21:45:01  0                                  cloud to h 5
22:00:05  0                                  cloud to h 5
22:15:06  0                                  cloud to h 5
22:30:09  0                                  cloud to h 5
22:45:19  0                                  cloud to h 5, contrail
23:00:32  0                                  cloud to h 5
23:15:32  0                                  cloud to h 5
23:30:54  0                                  cloud to h 5
23:45:53  0                                  cloud to h 5
00:00:47  I         1      8       -30   25  cloud below
00:15:47  0                                  cloud to h 5
00:30:47  I         1      7       -30   35  cloud below
00:45:53  I,II      2      8       -25  >35  cloud below
01:00:32  I         2      8       -30  >35  cloud below
01:15:32  I,IV      3     10       -30  >35  cloud below
01:30:32  IV        3     14       -30   30  cloud below
01:45:19  IV        3     12       -30   35  cloud below
02:00:09  IV        2     12       -20  >35  cloud below
02:15:02  0                                  cloud on horizon
02:30:01  0                                  cloud on horizon
02:45:02  0                                  cloud on horizon
03:00:01  0                                  cloud on horizon
03:15:01  0                                  cloud on horizon

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: 2013/07/14-15
Start: 00:00
End: 02:00
Forms: I,II,IV
Max elevation: 14
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130714-15.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)
-------- ------ ----- ----- ----- -----  ----- -------------------
22:45:19  4.000 338.0 -10.0  -1.9  35.3  0-255 q6530.jpg
00:00:47 15.000 355.7 -12.5  -3.5  10.2  0-255 q6556.jpg m6556.jpg
00:15:47 15.000 359.3 -12.5  -3.5   9.9  0-255 q6562.jpg m6562.jpg
00:30:47 15.000   2.9 -12.5  -3.5  10.0  0-255 q6568.jpg m6568.jpg
00:45:53 15.000   6.5 -12.3  -3.4  10.7  0-255 q6575.jpg m6575.jpg
01:00:32  8.000   9.9 -12.0  -3.2  12.0  0-255 q6580.jpg
01:15:32  8.000  13.5 -11.6  -3.0  14.3  0-255 q6586.jpg
01:30:32  8.000  17.0 -11.1  -2.6  18.6  0-255 q6592.jpg
01:45:19  4.000  20.4 -10.4  -2.2  27.2  0-255 q6596.jpg
02:00:09  2.000  23.8  -9.6  -1.6  51.0  0-255 q6599.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).