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NLC 2009-07-01/02

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: 2009-07-01/02

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  -------  ---- ----  --------------------------------
21:40  X                                  cloud to h 15
21:45  X                                  cloud to h 15
21:50  X                                  cloud to h 15
21:55  X                                  cloud to h 10
22:00  X                                  cloud to h 10
22:05  X                                  cloud to h 10
22:10  X                                  cloud to h 10
22:15  X                                  cloud to h 10
22:20  X                                  cloud to h 15
22:25  X                                  cloud to h 15
22:30  X                                  cloud to h 15
22:35  II      1                          amongst cirrus
22:40  II      1                          amongst cirrus
22:45  II      2                          amongst cirrus
22:50  II      2       10                 amongst cirrus
22:55  II      3       10                 amongst cirrus
23:00  II      3       10      <350  >20  amongst cloud
23:05  II      3       10      <350  >20  amongst cloud
23:10  II      3       10      <350  >20  amongst cloud
23:15  II      3       10      <355  >25  amongst cloud
23:20  II      3       10      <355  >25  amongst cloud
23:25  II      3       10      <350  >25  amongst cloud
23:30  II      3       10      <350  >25  amongst cloud
23:35  II                                 through cloud gap
23:40  NLC                                through cloud gap
23:45  NLC                                through cloud gap
23:50  NLC                                through cloud gap
23:55  NLC                                through cloud gap
00:00  X                                  cloudy
00:05  X                                  cloudy
00:10  X                                  cloudy
00:15  X                                  cloud to h 15
00:20  X                                  cloud to h 15
00:25  X                                  cloud to h 15
00:30  X                                  cloud to h 15
00:35  X                                  cloud to h 15
00:40  NLC     2       10      <345  >30  cloud to h 10
00:45  NLC     2       10      <340  >35  cloud to h 5
00:50  NLC     2       15      <350  >25  cloud to h 5
00:55  II      2       15      <355  >35  cloud to h 10
01:00  II      2       20       345  >35  cloud to h 10
01:05  II      2       20       350  >35  cloud to h 10
01:10  II,III  2       20       350  >35  cloud to h 10
01:15  II,III  3       20       350  >35  cloud to h 10
01:20  II      3       20       350  >35  cloud to h 5
01:25  II      3       20       350  >35  cloud to h 5
01:30  II,III  3       25       350  >35  cloud to h 10
01:35  II,III  3       25       350  >35  cloud to h 10
01:40  II,III  3       25       350  >35  cloud to h 5
01:45  II,III  3       25       350  >35  cloud to h 10
01:50  III     3       25       350  >35  cloud to h 10
01:55  III     3       25       350  >35  amongst cloud
02:00  II      3       15         0  >35  amongst cloud
02:05  II      2       15       350  >35  amongst cloud
02:10  III     1       15                 amongst cloud
02:15  X                                  cloud to h 15
02:20  III     1       15                 cloud to h 10
02:25  X                                  cloud to h 15
02:30  X                                  cloud to h 15
02:35  X                                  cloud to h 10
02:40  X                                  cloud to h 10
02:45  X                                  cloud to h 10
02:50  X                                  cloud to h 10
02:55  X                                  cloud to h 10

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: 2009/07/01-02
Start: 22:35
End: 02:20
Forms: II,III
Max elevation: 25
Max brightness: 3
Comments:
Cloud 00:00 to 00:35.
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-01/02>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)
----- ------ ----- ----- ----- -----  ----- ---------------------
22:35  1.300 336.5  -8.1  -0.5 142.6  0-255 q04538.jpg m04538.jpg
22:40  2.500 337.6  -8.4  -0.7 132.5  0-255 q04539.jpg m04539.jpg
22:45  2.500 338.7  -8.7  -0.9 118.6  0-255 q04540.jpg m04540.jpg
22:50  3.200 339.9  -8.9  -1.1 101.2  0-255 q04541.jpg
22:55  4.000 341.0  -9.1  -1.3  82.6  0-255 q04543.jpg
23:00  2.000 342.2  -9.4  -1.5  66.2  0-200 q04546.jpg
23:05  4.000 343.3  -9.6  -1.6  53.7  0-255 q04548.jpg
23:10  4.000 344.4  -9.8  -1.8  44.6  0-200 q04551.jpg
23:15  4.000 345.6 -10.0  -1.9  38.2  0-200 q04554.jpg
23:20  4.000 346.8 -10.1  -2.0  33.4  0-200 q04557.jpg
23:25  4.000 347.9 -10.3  -2.1  29.9  0-200 q04560.jpg
23:30  8.000 349.1 -10.4  -2.2  27.2  0-255 q04563.jpg
23:35  8.000 350.2 -10.5  -2.3  25.0  0-255 q04567.jpg
23:40  8.000 351.4 -10.7  -2.3  23.4  0-255 q04571.jpg
23:45  8.000 352.6 -10.7  -2.4  22.1  0-255 q04575.jpg
23:50  8.000 353.7 -10.8  -2.5  21.1  0-255 q04579.jpg
23:55  8.000 354.9 -10.9  -2.5  20.3  0-200 q04583.jpg
00:40  8.000   5.4 -10.9  -2.5  20.5  0-200 q04619.jpg
00:45  8.000   6.6 -10.8  -2.5  21.3  0-200 q04623.jpg
00:50  8.000   7.8 -10.7  -2.4  22.4  0-255 q04627.jpg
00:55  8.000   8.9 -10.6  -2.3  23.8  0-255 q04631.jpg
01:00  8.000  10.1 -10.5  -2.3  25.6  0-255 q04635.jpg
01:05  4.000  11.3 -10.4  -2.2  27.8  0-200 q04639.jpg
01:10  4.000  12.4 -10.2  -2.1  30.7  0-200 q04642.jpg
01:15  4.000  13.6 -10.1  -2.0  34.6  0-200 q04645.jpg
01:20  4.000  14.7  -9.9  -1.8  39.7  0-255 q04648.jpg
01:25  2.000  15.9  -9.7  -1.7  46.8  0-200 q04652.jpg
01:30  2.000  17.0  -9.5  -1.6  56.6  0-200 q04655.jpg
01:35  2.000  18.2  -9.3  -1.4  70.2  0-200 q04657.jpg
01:40  2.000  19.3  -9.1  -1.2  87.4  0-200 q04659.jpg
01:45  2.000  20.5  -8.8  -1.1 106.1  0-255 q04661.jpg
01:50  2.500  21.6  -8.6  -0.9 122.7  0-255 q04662.jpg
01:55  2.000  22.7  -8.3  -0.6 135.5  0-255 q04663.jpg
02:00  1.300  23.9  -8.1  -0.4 144.8  0-255 q04664.jpg
02:05  1.300  25.0  -7.8  -0.1 151.5  0-255 q04665.jpg
02:10  1.000  26.1  -7.5   0.2 156.5  0-255 q04666.jpg m04666.jpg
02:20  0.600  28.3  -6.8   0.9 163.3  0-255 q04668.jpg m04668.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).