chi and h site logo

NLC 2010-07-29/30

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: 2010-07-29/30

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  --- ---  ---- ----  --------------------------------
21:00  X                                  overcast
21:15  X                                  overcast
21:30  X                                  overcast
21:45  X                                  overcast
22:00  X                                  almost overcast
22:15  X                                  overcast
22:30  X                                  almost overcast
22:45  X                                  overcast
23:00  X                                  almost overcast, lightbox
23:15  X                                  almost overcast, lightbox
23:30  X                                  almost overcast, lightbox
23:45  X                                  overcast
00:00  X                                  overcast
00:15  X                                  overcast
00:30  X                                  overcast
00:45  X                                  overcast
01:00  X                                  overcast
01:15  X                                  almost overcast
01:30  NLC?                               through cloud
01:45  NLC         2   ~5      <345  >15  through cloud
02:00  I,II        3    6                 through cloud
02:15  I,II        3                      through cloud
02:30  X                                  widespread cloud patches
02:45  X                                  only partly clear
03:00  X                                  widespread cloud patches
03:15  X                                  widespread cloud patches
03:30  X                                  widespread cloud patches

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: 2010/07/29-30
Start: 01:30
End: 02:15
Forms: I,II
Max elevation: 6
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2010-07-29/30">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)
----- ------ ----- ----- ----- -----  ----- ---------------------
01:30 30.000  18.0 -14.2  -4.5   5.5  0-255 q33343.jpg
01:45 30.000  21.6 -13.4  -4.1   7.1  0-255 q33349.jpg
02:00 15.000  25.2 -12.6  -3.6   9.7  0-255 q33354.jpg
02:15  8.000  28.7 -11.6  -3.0  14.2  0-255 q33359.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).