NLC 2009-07-15/16
From chi and h
Contents |
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.
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).
