NLC 2015-07-21/22
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 compact camera with limited field of view
A ~325-35, h ~0-40; images every 15 min
Date: 2015-07-21/22
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:15:04 X overcast
21:30:01 X widespread cloud
21:45:01 0 cloud to h 5
22:00:02 0 cloud to h 5
22:15:10 0 cloud to h 5
22:30:31 0 patchy cloud to h 10
22:45:32 I 1 5 through cloud
23:00:54 I 3 8 350 >35
23:15:47 I 3 through cloud
23:30:47 I 3 through cloud
23:45:47 X almost overcast
00:00:47 I 2 through cloud
00:16:25 I 3 7 325 >35
00:31:24 I,II 4 7 330 >35
00:45:47 I,II 5 7 330 >35
01:00:26 I,III 5 8 335 >35
01:15:26 I,III 5 9 335 >35
01:30:32 I,III 5 11 335 >35
01:45:19 III,IV 5 14 330 >35
02:00:19 I.II 4 15 some cloud patches
02:15:10 II,III 3 15 some cloud patches
02:30:03 I 2 12 <325 10
02:45:06 I 1 5 <325 350
03:00:04 X some cloud
03:15:01 X some cloud
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: 2015/07/21-22
Start: 22:45
End: 02:45
Forms: I,II,III,IV
Max elevation: 15
Max brightness: 5
Comments: Some cloud patches.
http://www.chiandh.eu/nlccam/20150721-22.shtml
forms: I: veil
II: bands
III: waves
IV: whirls
NLC: 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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:45:32 8.000 337.7 -11.2 -2.7 17.8 0-255 q5165.jpg 23:00:54 15.000 341.3 -11.9 -3.1 12.7 0-255 q5171.jpg 23:15:47 15.000 344.8 -12.5 -3.5 10.0 0-255 q5176.jpg 23:30:47 15.000 348.4 -13.0 -3.8 8.3 0-255 q5182.jpg 00:00:47 15.000 355.6 -13.6 -4.1 6.7 0-255 q5194.jpg 00:16:25 30.000 359.3 -13.7 -4.2 6.5 0-255 q5201.jpg 00:31:24 30.000 2.9 -13.7 -4.2 6.5 0-255 q5207.jpg 00:45:47 15.000 6.4 -13.5 -4.1 6.9 0-255 q5212.jpg 01:00:26 8.000 9.9 -13.2 -3.9 7.7 0-255 q5217.jpg 01:15:26 8.000 13.5 -12.8 -3.7 9.0 0-255 q5223.jpg 01:30:32 8.000 17.1 -12.2 -3.3 11.1 0-255 q5230.jpg 01:45:19 4.000 20.6 -11.6 -2.9 14.7 0-255 q5235.jpg 02:00:19 4.000 24.1 -10.8 -2.4 21.8 0-255 q5241.jpg 02:15:10 2.000 27.5 -9.9 -1.8 41.0 0-255 q5245.jpg 02:30:03 1.000 30.9 -8.9 -1.1 105.7 0-255 q5247.jpg 02:45:06 1.000 34.2 -7.7 -0.1 152.3 0-255 q5250.jpg m5250.jpg exp: Exposure time in seconds (200 ISO, f/2.8). 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).
