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NLC 2010-07-04/05

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: 2010-07-04/05

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:30  0                                  cloud to h 12
21:45  0                                  cloud to h 15
22:00  NLC?        1   11  10     5   15  small cloud patches to h 15
22:15  X                                  patchy cloud
22:30  X                                  cloud covering most of field
22:45  X                                  cloud covering most of field
23:00  NLC         1    5   3     0    4  through cloud
23:15  NLC         3   11   2  ~345    8  through cloud
23:30  II,IV       3   12   2  ~335    9  through cloud
23:45  II,III      4   10   1  <350  >15  through cloud, lightbox
00:00  NLC         3    5                 through cloud
00:15  NLC         3                      through cloud
00:30  NLC         2                      through cloud
00:45  X                                  overcast
01:00  X                                  overcast
01:15  X                                  overcast
01:30  X                                  overcast
01:45  X                                  overcast
02:00  X                                  overcast
02:15  X                                  overcast
02:30  X                                  overcast
02:45  X                                  overcast
03:00  X                                  overcast

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: 2010/07/04-05
Start: 23:00
End: 00:30
Forms: II,III,IV
Max elevation: 12
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-07-04/05">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)
----- ------ ----- ----- ----- -----  ----- ---------------------
22:00  0.125 329.2  -6.5   1.4 165.5  0-255 q30870.jpg m30870.jpg
23:00  2.000 342.7 -10.0  -1.9  37.9  0-255 q30879.jpg m30879.jpg
23:15  3.200 346.1 -10.5  -2.3  25.2  0-255 q30883.jpg
23:30  5.000 349.6 -11.0  -2.6  19.5  0-255 q30887.jpg
23:45  6.000 353.1 -11.3  -2.8  16.7  0-255 q30892.jpg m30892.jpg
00:00  8.000 356.7 -11.5  -2.9  15.3  0-255 q30897.jpg
00:15  8.000   0.2 -11.5  -2.9  14.9  0-255 q30902.jpg
00:30  8.000   3.7 -11.5  -2.9  15.3  0-255 q30907.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).