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NLC 2009-06-17/18

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: 2009-06-17/18

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  -------  ---- ----  --------------------------------
21:40  X                                  cloud h 5 to 25
21:45  0                                  patchy cloud
21:50  NLC?                               cloud to h 5, some higher patches
21:55  II      1       15   5   350   25  cloud to h 5, on left to h 20
22:00  X                                  patchy cloud
22:05  II      1       15   5             patchy cloud
22:10  II      1       20  10  <360  >35  partial cloud cover
22:15  X                                  cloud
22:20  III     1                          through cloud gap
22:25  NLC     2                          cloud patches
22:30  NLC     2                          cloud patches
22:35  III     2       35  10  <325  >35  partly obstructed by cloud
22:40  III,IV  3       35  15  <325  >35  partly obstructed by cloud
22:45  III     3       40  10  <325  >35  clear, cloud below
22:50  II,III  2       40   5  <325  >35  partly obstructed by cloud
22:55  II,III  2       35   5  <325  >35  few cloud patches
23:00  II,III  2       30   5  <325   30  clear
23:05  II,III  2       30   5  <325  >35  clear
23:10  II,III  2       30   5  <325  >35  clear
23:15  II,III  2       30   5  <325  >35  clear
23:20  II,III  3       35   5  <325  >35  clear
23:25  III     3       30   5  <325  >35  clear
23:30  II,III  3       30   5  <325  >35  some cloud patches
23:35  II,III  3       25   5             partly obscured by cloud
23:40  II      3       25  <5  <325  >25  partly obscured by cloud
23:45  II      3       20   5  <325   30  partly obscured by cloud
23:50  II      4       15   5  <325   30  partly obscured by cloud
23:55  II                                 partly obscured by cloud
00:00  II      4                          partly obscured by cloud
00:05  II      4       15   5  <325   30  cloud to h 5
00:10  II      4       15   5  <325   30  cloud to h 5
00:15  II,III  4       15   5  <325   30  cloud to h 5
00:20  II,III  4       15   5  <325   25  cloud to h 5
00:25  II,III  4       15   5  <325   20  cloud to h 5
00:30  II,III  4       15   5  <325   15  cloud to h 5
00:35  II,III  4       15   5  <325   10  cloud to h 10
00:40  II,III  4       15      <325   10  cloud to h 10
00:45  II,III  4       15      <325   10  cloud to h 10
00:50  II,III  4       15      <325   10  cloud to h 10
00:55  II,III  3       15      <325    5  cloud to h 10
01:00  II      3       20              5  partly obstructed by cloud
01:05  II      3       25                 partly obstructed by cloud
01:10  X                                  cloudy
01:15  II      3       30      <325  355  cloud to h 10
01:20  II      3       30      <325  355  cloud to h 10
01:25  II      3       35   5  <325  355  cloud to h 5
01:30  IV      2       40   5  <325  350  cloud to h 5
01:35  IV      2      >40   5  <325  350  cloud to h 5
01:40  IV      2       35   5  <325  350  cloud to h 5
01:45  IV      2      >40      <325  345  cloud to h 5
01:50  NLC     1               <325  335  cloud to h 5
01:55  NLC     1               <325  335  cloud to h 5
02:00  0                                  cloud to h 5
02:05  0                                  cloud to h 5
02:10  X                                  cloud
02:15  X                                  cloud
02:20  0                                  cloud to h 5
02:25  0                                  cloud to h 5
02:30  0                                  cloud to h 5
02:35  0                                  cloud to h 5
02:40  0                                  cloud to h 5
02:45  0                                  cloud to h 5
02:50  0                                  cloud to h 5

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: Edinburgh
Date: 2009/06/17-18
Start: 21:55
End: 01:55
Forms: II, III, IV
Max elevation: >40
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-06-17/18>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)
----- ------ ----- ----- ----- -----  ----- ---------------------
21:55  0.200 328.4  -5.4   3.9 170.8  0-255 q2632.jpg m2632.jpg
22:05  0.300 330.5  -6.1   2.1 167.8  0-255 q2634.jpg m2634.jpg
22:10  0.400 331.6  -6.4   1.5 166.0  0-255 q2635.jpg m2635.jpg
22:20  0.800 333.9  -7.1   0.6 161.0  0-255 q2637.jpg
22:25  1.000 335.0  -7.4   0.3 157.6  0-255 q2638.jpg
22:30  1.300 336.1  -7.7  -0.0 153.3  0-255 q2639.jpg
22:35  1.300 337.2  -7.9  -0.3 147.6  0-255 q2640.jpg
22:40  2.000 338.4  -8.2  -0.5 139.9  0-255 q2641.jpg
22:45  2.500 339.5  -8.5  -0.8 129.7  0-255 q2642.jpg
22:50  2.000 340.6  -8.7  -0.9 116.2  0-255 q2643.jpg
22:55  2.000 341.8  -8.9  -1.1  99.9  0-255 q2644.jpg
23:00  2.000 342.9  -9.1  -1.3  83.0  0-255 q2645.jpg
23:05  2.000 344.0  -9.3  -1.4  68.1  0-255 q2646.jpg
23:10  2.000 345.2  -9.5  -1.6  56.4  0-200 q2647.jpg
23:15  4.000 346.3  -9.7  -1.7  47.7  0-255 q2648.jpg
23:20  8.000 347.5  -9.9  -1.8  41.4  0-255 q2649.jpg
23:25  8.000 348.6 -10.0  -1.9  36.7  0-255 q2650.jpg
23:30  8.000 349.8 -10.1  -2.0  33.1  0-255 q2651.jpg
23:35  8.000 351.0 -10.2  -2.1  30.4  0-255 q2652.jpg
23:40  4.000 352.1 -10.4  -2.2  28.3  0-200 q2653.jpg
23:45  4.000 353.3 -10.4  -2.2  26.7  0-200 q2654.jpg
23:50  4.000 354.4 -10.5  -2.3  25.4  0-200 q2655.jpg
23:55  4.000 355.6 -10.6  -2.3  24.5  0-200 q2656.jpg
00:00  4.000 356.8 -10.6  -2.3  23.8  0-255 q2657.jpg
00:05  4.000 357.9 -10.7  -2.4  23.4  0-255 q2658.jpg
00:10  4.000 359.1 -10.7  -2.4  23.1  0-255 q2659.jpg
00:15  4.000   0.3 -10.7  -2.4  23.1  0-255 q2660.jpg
00:20  4.000   1.4 -10.7  -2.4  23.2  0-255 q2661.jpg
00:25  4.000   2.6 -10.6  -2.3  23.6  0-255 q2662.jpg
00:30  4.000   3.8 -10.6  -2.3  24.1  0-255 q2663.jpg
00:35  4.000   4.9 -10.5  -2.3  24.9  0-255 q2664.jpg
00:40  4.000   6.1 -10.5  -2.2  26.0  0-255 q2665.jpg
00:45  4.000   7.3 -10.4  -2.2  27.4  0-255 q2666.jpg
00:50  4.000   8.4 -10.3  -2.1  29.2  0-255 q2667.jpg
00:55  4.000   9.6 -10.2  -2.0  31.6  0-255 q2668.jpg
01:00  4.000  10.8 -10.1  -2.0  34.7  0-255 q2669.jpg
01:05  4.000  11.9  -9.9  -1.9  38.8  0-255 q2670.jpg
01:15  4.000  14.2  -9.6  -1.6  51.7  0-200 q2672.jpg
01:20  4.000  15.4  -9.4  -1.5  61.7  0-200 q2673.jpg
01:25  4.000  16.5  -9.2  -1.4  75.1  0-200 q2674.jpg
01:30  4.000  17.7  -9.0  -1.2  91.2  0-255 q2675.jpg
01:35  3.200  18.8  -8.8  -1.0 108.2  0-255 q2676.jpg
01:40  2.500  19.9  -8.6  -0.9 123.3  0-255 q2677.jpg
01:45  2.000  21.1  -8.3  -0.6 135.1  0-255 q2678.jpg
01:50  1.600  22.2  -8.1  -0.4 144.0  0-255 q2679.jpg
01:55  1.300  23.3  -7.8  -0.2 150.6  0-255 q2680.jpg m2680.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).