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NLC 2010-07-02/03

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: Stichill Eastfield, 55.7N 2.4W
          unattended dSLR with limited field of view A ~310-20, h ~0-40
          images every 15 min
Date: 2010-07-02/03

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:30  X                                  widespread cirrus
21:45  X                                  widespread cirrus
22:00  X                                  widespread cirrus
22:15  X                                  widespread cirrus
22:30  X                                  widespread cirrus
22:45  X                                  almost overcast
23:00  X                                  overcast
23:15  X                                  overcast
23:30  X                                  widespread cloud
23:45  X                                  only partly clear
00:00  I,III       2   10                 cloud to h 7, on left to h 20
00:15  III         2   10      <345  >15  cloud to h 7, some higher patches on left
00:30  II,III      4   11       330  >15  some cloud
00:45  IV          4   12      <345  >15  some cloud
01:00  NLC         3                      through cloud
01:15  NLC         3                      through cloud
01:30  I,IV        3                      through cloud
01:45  II          3   19   5   330  >15  clear
02:00  III,IV      3   22   7   325   13  only a few cloud patches
02:15  II,III      2   13   8   330   10  clear
02:30  NLC         1   12                 clear
02:45  0                                  clear

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: 2010/07/02-03
Start: 00:00
End: 02:30
Forms: I,II,III,IV
Max elevation: 22
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-07-02/03">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 13.000 356.8 -11.3  -2.8  16.5  0-255 q30761.jpg m30761.jpg
00:15 13.000   0.3 -11.4  -2.8  16.1  0-255 q30766.jpg m30766.jpg
00:30  6.000   3.8 -11.3  -2.8  16.6  0-255 q30770.jpg
00:45  5.000   7.3 -11.1  -2.6  18.4  0-255 q30774.jpg
01:00  8.000  10.8 -10.8  -2.4  22.0  0-255 q30779.jpg
01:15  6.000  14.3 -10.3  -2.1  29.3  0-255 q30783.jpg
01:30  3.200  17.7  -9.7  -1.7  46.9  0-255 q30786.jpg m30786.jpg
01:45  1.000  21.2  -9.0  -1.2  93.1  0-255 q30787.jpg m30787.jpg
02:00  1.000  24.6  -8.2  -0.5 140.6  0-255 q30790.jpg m30790.jpg
02:15  0.400  27.9  -7.3   0.4 159.1  0-255 q30792.jpg m30792.jpg
02:30  0.200  31.2  -6.2   1.8 167.2  0-255 q30794.jpg m30794.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).