NLC 2009-06-17/18
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: 2009-06-17/18
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 images a second version is available, where an aggressive unsharp mask has been applied to reveal faint detail.
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).
