NLC 2018-06-16/17
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: 2018-06-16/17
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:02 0 clear
22:00:02 0 clear
22:15:02 0 clear
22:30:02 0 clear
22:45:02 0 clear
23:00:03 0 clear
23:15:10 0 clear
23:30:19 II 1 13 340 10 clear
23:45:18 II 2 16 340 30 clear
00:00:19 II 3 18 340 30 clear
00:15:19 I,II 3 20 <325 30 clear
00:30:18 I,II 3 20 <325 >35 clear
00:45:19 I,II 3 20 <325 >35 clear
01:00:19 I,II 2 20 330 >35 clear
01:15:09 I,II 2 25 335 30 clear
01:30:09 II 2 35 335 30 clear
01:45:08 II 1 40 335 30 clear
02:00:06 NLC 1 45 340 35 clear
02:15:05 0 clear
02:30:05 0 clear
02:45:04 0 clear
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: 2018/06/16-17
Start: 23:30
End: 02:00
Forms: I,II
Max elevation: 45
Max brightness: 3
Comments: clear
http://www.chiandh.eu/nlccam/20180616-17.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 23:30:19 4.000 349.9 -10.2 -2.0 32.0 0-255 q9613.jpg m9613.jpg 23:45:18 4.000 353.4 -10.5 -2.2 26.0 0-255 q9617.jpg m9617.jpg 00:00:19 4.000 356.9 -10.7 -2.4 23.3 0-255 q9621.jpg m9621.jpg 00:15:19 4.000 0.4 -10.7 -2.4 22.6 0-255 q9625.jpg m9625.jpg 00:30:18 4.000 3.9 -10.6 -2.3 23.7 0-255 q9629.jpg m9629.jpg 00:45:19 4.000 7.4 -10.4 -2.2 27.0 0-255 q9633.jpg m9633.jpg 01:00:19 4.000 10.9 -10.1 -2.0 34.3 0-255 q9637.jpg m9637.jpg 01:15:09 2.000 14.3 -9.6 -1.7 50.8 0-255 q9640.jpg m9640.jpg 01:30:09 2.000 17.7 -9.1 -1.2 90.0 0-255 q9643.jpg m9643.jpg 01:45:08 2.000 21.2 -8.4 -0.7 134.6 0-255 q9645.jpg m9645.jpg 02:00:06 1.000 24.5 -7.5 0.1 155.4 0-255 q9647.jpg m9647.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).
