NLC 2009-07-15/16
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: 2009-07-15/16
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
----- ----- ------ ------- ---- ---- --------------------------------
21:30 0 cloud to h 10
21:45 II 1 10 15 30 cloud patches to h 5
22:00 II 2 10 5 5 >35 clear
22:15 III 2 10 0 0 30 clear
22:30 III 2 10 0 355 25 clear
22:45 IV 2 15 5 350 5 clear
23:00 I,II 1 10 0 350 30 clear
23:15 II 2 5 0 5 30 among some low cloud
23:30 NLC 2 5 0 5 25 among some low cloud
23:45 NLC 2 5 0 5 30 among some low cloud, aeroplane trail
00:00 III 2 5 0 5 >35 among cloud
00:15 III 2 5 0 cloud nearby, aeroplane trail
00:30 III 2 5 some cloud on horizon
00:45 III 3 5 15 >35 some cloud on horizon
01:00 III 3 5 15 >35 clear
01:15 III 2 10 0 15 >35 clear, few cloud patches
01:30 0 few cloud patches
01:45 NLC 2 on horiz 355 5 some cloud
02:00 NLC? on horiz 340 355 cloud above h 5
02:15 NLC? on horiz 345 355 cloud above h 5
02:30 X cloud above h 5
02:45 X cloud above h 5
03:00 X cloud above h 5
03:15 X cloud above 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: 2009/07/15-16
Start: 21:45
End: 01:15
Forms: O
Max elevation: 10
Max brightness: 3
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-07-15/16>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 ----- ------ ----- ----- ----- ----- ----- ------------ 21:45 0.300 324.4 -6.1 2.0 167.7 0-255 q07138.jpg 22:00 0.800 327.7 -7.3 0.4 158.7 0-255 q07141.jpg 22:15 2.000 331.1 -8.4 -0.7 134.2 0-255 q07144.jpg 22:30 5.000 334.5 -9.3 -1.4 69.0 0-255 q07149.jpg 22:45 10.000 337.9 -10.2 -2.0 32.0 0-255 q07157.jpg 23:00 20.000 341.4 -10.9 -2.5 20.2 0-255 q07168.jpg 23:15 15.000 344.9 -11.5 -2.9 15.0 0-255 q07182.jpg 23:30 15.000 348.4 -12.0 -3.2 12.2 0-255 q07197.jpg 23:45 25.000 352.0 -12.4 -3.4 10.6 0-255 q07211.jpg 00:00 25.000 355.5 -12.6 -3.6 9.7 0-255 q07226.jpg 00:15 25.000 359.1 -12.7 -3.6 9.3 0-255 q07241.jpg 00:30 25.000 2.7 -12.7 -3.6 9.4 0-255 q07256.jpg 00:45 15.000 6.2 -12.5 -3.5 10.0 0-255 q07272.jpg 01:00 25.000 9.8 -12.2 -3.3 11.2 0-255 q07286.jpg 01:15 15.000 13.4 -11.8 -3.1 13.3 0-255 q07302.jpg 01:45 8.000 20.4 -10.6 -2.3 24.4 0-255 q07330.jpg 02:00 4.000 23.8 -9.8 -1.8 43.8 0-255 q07340.jpg 02:15 2.000 27.2 -8.9 -1.1 103.0 0-255 q07348.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).
