chi and h site logo

NLC 2009-06-10/11

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 dSLR with limited field of view A ~325-35, h ~0-40
          images every 5 min
Date: 2009-06-10/11

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  -------  ---- ----  --------------------------------
21:35  X                                  thick cirrus
21:40  X                                  thick cirrus
21:45  X                                  thick cirrus
21:50  X                                  thick cirrus
21:55  X                                  thick cirrus
22:00  X                                  thick cirrus
22:05  X                                  thick cirrus
22:10  X                                  thick cirrus
22:15  X                                  thick cirrus
22:20  X                                  thick cirrus
22:25  X                                  thick cirrus
22:30  X                                  thick cirrus
22:35  NLC?                               through cloud gap
22:40  NLC                                through cloud gap
22:45  NLC?                               through cloud gap
22:50  NLC?                               through cloud gap
22:55  NLC                                cloudy
23:00  NLC     2                          cloudy
23:05  NLC     2                          cloud to h 5, to h 15 on right
23:10  II,III  2       15  <5  <325  >15  cloud to h 5
23:15  II,III  2       15  <5  <325  >20  cloud to h 5
23:20  II,III  2       15  <5  <325  >15  cloud to h 5
23:25  II,III  2       15  <5  <325  >25  cloud to h 5
23:30  II,III  2       15  <5  <325  >25  cloud to h 5, patches of cirrus
23:35  NLC     2                          cloud to h 5, patches of cirrus
23:40  NLC                                cloud to h 5, patches of cirrus
23:45  NLC                                cloud to h 5, patches of cirrus
23:50  NLC                                through cloud gap
23:55  NLC                                through cloud gap
00:00  NLC                                through cloud gap
00:05  NLC                                through cloud gap
00:10  NLC                                through cloud gap
00:15  NLC                                through cloud gap
00:20  NLC                                through cloud gap
00:25  NLC                                through cloud gap
00:30                                     camera failure, no further images

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: only in binoculars
            3: intensely bright and vivid
            2: else

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: 2009/06/10-11
Start: 22:35
End: 00:25
Forms: II, III
Max elevation: 15
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-06-10/11>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
----- ------ ----- ----- ----- -----  ----- ---------
22:35  2.000 337.5  -8.3  -0.7 135.0  0-150 q2224.jpg
22:40  2.000 338.6  -8.6  -0.9 122.1  0-150 q2225.jpg
22:45  2.000 339.7  -8.9  -1.1 105.5  0-130 q2226.jpg
22:50  4.000 340.9  -9.1  -1.3  87.0  0-200 q2227.jpg
22:55  4.000 342.0  -9.3  -1.4  70.0  0-200 q2228.jpg
23:00  4.000 343.2  -9.5  -1.6  56.6  0-200 q2229.jpg
23:05  4.000 344.3  -9.7  -1.7  46.9  0-150 q2230.jpg
23:10  4.000 345.5  -9.9  -1.8  39.9  0-150 q2231.jpg
23:15  4.000 346.6 -10.1  -2.0  34.7  0-150 q2232.jpg
23:20  8.000 347.8 -10.2  -2.1  31.0  0-200 q2233.jpg
23:25  8.000 348.9 -10.4  -2.2  28.1  0-150 q2234.jpg
23:30  8.000 350.1 -10.5  -2.2  25.8  0-150 q2235.jpg
23:35  8.000 351.3 -10.6  -2.3  24.1  0-150 q2236.jpg
23:40  8.000 352.4 -10.7  -2.4  22.7  0-150 q2237.jpg
23:45  8.000 353.6 -10.8  -2.4  21.6  0-150 q2238.jpg
23:50  8.000 354.8 -10.9  -2.5  20.8  0-150 q2239.jpg
23:55  8.000 355.9 -10.9  -2.5  20.2  0-130 q2240.jpg
00:00  8.000 357.1 -11.0  -2.5  19.7  0-130 q2241.jpg
00:05  8.000 358.3 -11.0  -2.6  19.4  0-130 q2242.jpg
00:10  8.000 359.5 -11.0  -2.6  19.3  0-130 q2243.jpg
00:15  8.000   0.6 -11.0  -2.6  19.3  0-130 q2244.jpg
00:20  8.000   1.8 -11.0  -2.6  19.4  0-100 q2245.jpg
00:25  8.000   3.0 -11.0  -2.5  19.8  0-130 q2246.jpg

exp: Exposure time in seconds (200 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).