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NLC 2010-06-19/20

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: Stichill Eastfield, 55.7N 2.4W
          unattended dSLR with limited field of view A ~310-20, h ~0-40
          images every 15 min
Date: 2010-06-19/20

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:45  0                                  clear, 10% overexposed
22:00  0                                  clear, 10% overexposed
22:15  0                                  clear, 10% overexposed
22:30  0                                  clear, 10% overexposed
22:45  0                                  clear, 10% overexposed
23:00  X                                  cloud on the left
23:15  X                                  sizable cloud patch, fake NLC?
23:30  0                                  almost clear
23:45  0                                  almost clear
00:00  II,IV       1   10       320    5  almost clear
00:15  II,IV       1    8       315    3  almost clear
00:30  IV          1   10       315  340  cloud to h 3
00:45  IV          1   13       315  360  cloud to h 4
01:00  IV          1   15       318  355  cloud to h 4
01:15  II          2   17       313  355  cloud to h 3
01:30  II          2   18       315  352  cloud to h 4
01:45  II          1   20      <310  350  cloud to h 5
02:00  II          1   18      <310  330  almost clear
02:15  0                                  cloud to h 10
02:30  0                                  cloud to h 7
02:45  0                                  cloud to h 4

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: Stichill
Date: 2010/06/19-20
Start: 00:00
End: 02:00
Forms: II,IV
Max elevation: 20
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-06-19/20">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)
----- ------ ----- ----- ----- -----  ----- ---------------------
00:00  4.000 357.4 -10.9  -2.5  20.5  0-255 q30003.jpg m30003.jpg
00:15  4.000   0.9 -10.9  -2.5  20.1  0-255 q30007.jpg m30007.jpg
00:30  4.000   4.4 -10.8  -2.5  21.2  0-255 q30011.jpg m30011.jpg
00:45  4.000   7.9 -10.6  -2.3  24.2  0-255 q30015.jpg m30015.jpg
01:00  2.000  11.4 -10.2  -2.1  30.6  0-255 q30018.jpg m30018.jpg
01:15  2.000  14.8  -9.8  -1.7  45.1  0-255 q30021.jpg m30021.jpg
01:30  1.000  18.3  -9.2  -1.3  81.7  0-255 q30023.jpg m30023.jpg
01:45  1.000  21.7  -8.4  -0.7 131.0  0-255 q30025.jpg m30025.jpg
02:00  0.600  25.0  -7.6   0.0 154.5  0-255 q30026.jpg m30026.jpg

exp: Exposure time in seconds (400 ISO, f/3.5).
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).

In addition, the following images were taken from Edinburgh, 55.9N 3.2W. The field of view is the same size, but the camera was pointed at various different directions.

  UT    exp   stretch  image      (masked)
----- ------   ----- -------------------------
23:52  2.500   0-255 q15333.jpg
00:00  2.500   0-255 q15334.jpg
00:08  2.500   0-255 q15335.jpg
00:09  2.500   0-255 q15336.jpg
00:16  2.500   0-255 q15337.jpg m15337.jpg
00:20  2.500   0-255 q15338.jpg m15338.jpg
00:21  2.500   0-255 q15339.jpg m15339.jpg
00:21  2.500   0-255 q15340.jpg m15340.jpg
00:30  2.500   0-255 q15341.jpg m15341.jpg
00:30  2.500   0-255 q15342.jpg m15342.jpg
00:30  2.500   0-255 q15343.jpg m15343.jpg
00:45  2.500   0-255 q15344.jpg m15344.jpg
00:45  2.500   0-255 q15345.jpg m15345.jpg
00:45  2.500   0-255 q15346.jpg m15346.jpg

exp: Exposure time in seconds (400 ISO, f/3.5).
stretch: Contrast stretch (0-255 means no stretch).