NLC 2013-05-24/25
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: 2013-05-24/25
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:15:01 0 cirrus on left to h 20
21:30:01 0 cirrus on left to h 10 or 15
21:45:02 0 cirrus on left to h 10
22:00:02 0 cirrus on left to h 10
22:15:09 I? 1 20 10 cirrus on left to h 10
22:30:19 I 2 18 8 -30 25 cirrus on left to h 10
22:45:32 I,IV 2 13 <-35 20 cirrus on left to h 10
23:00:32 I 2 10 <-25 30 cirrus on left to h 10
23:15:32 I,II 2 10 -25 25 cirrus on left to h 5
23:30:47 I 2 8 -25 25
23:45:47 I 2 6 -15 20
00:00:46 I 2 5 -15 20
00:15:47 I 1 5 -15 15
00:30:47 IV 1 5 -15 10
00:45:46 IV 2 5 -20 15
01:00:54 II,IV 2 5 -25 >35
01:15:32 II,IV 1 5 -30 30
01:30:32 I 1 8 -30 >35
01:45:09 II 1 5 20 >35
02:00:10 IV 1 20 -10 20
02:15:03 IV 1 25 -10 15
02:30:02 0
02:45:01 0
03:00:01 0
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: 2013/05/24-25
Start: 22:15
End: 02:15
Forms: I,II,IV
Max elevation: 25
Max brightness: 2
Comments:
<a href="http://www.chiandh.me.uk/nlccam/20130524-25.shtml">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) -------- ------ ----- ----- ----- ----- ----- ------------------- 22:15:09 2.000 333.0 -9.4 -1.5 62.9 0-255 q2894.jpg m2894.jpg 22:30:19 4.000 336.5 -10.3 -2.1 28.9 0-255 q2898.jpg 22:45:32 8.000 340.0 -11.1 -2.6 18.2 0-255 q2903.jpg 23:00:32 8.000 343.5 -11.8 -3.1 13.5 0-255 q2908.jpg 23:15:32 8.000 347.1 -12.3 -3.4 10.9 0-255 q2914.jpg 23:30:47 15.000 350.7 -12.7 -3.6 9.3 0-255 q2920.jpg 23:45:47 15.000 354.3 -13.0 -3.8 8.4 0-255 q2926.jpg 00:00:46 15.000 357.9 -13.1 -3.9 8.0 0-255 q2932.jpg 00:15:47 15.000 1.5 -13.1 -3.9 8.0 0-255 q2938.jpg 00:30:47 15.000 5.1 -13.0 -3.8 8.3 0-255 q2944.jpg 00:45:46 15.000 8.6 -12.8 -3.7 9.1 0-255 q2950.jpg 01:00:54 15.000 12.2 -12.4 -3.4 10.6 0-255 q2957.jpg m2957.jpg 01:15:32 8.000 15.7 -11.9 -3.1 12.9 0-255 q2962.jpg m2962.jpg 01:30:32 8.000 19.2 -11.2 -2.7 17.1 0-255 q2968.jpg m2968.jpg 01:45:09 2.000 22.6 -10.5 -2.3 25.6 0-255 q2971.jpg m2971.jpg 02:00:10 2.000 26.1 -9.6 -1.7 50.6 0-255 q2975.jpg m2975.jpg 02:15:03 1.000 29.4 -8.7 -0.9 118.7 0-255 q2977.jpg m2977.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).
