
NLC 2018-08-08/09
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: 2018-08-08/09 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 20:45:05 0 clear 21:00:06 0 clear 21:15:09 0 clear 21:30:19 0 clear 21:45:52 0 almost clear 22:01:24 0 almost clear 22:17:33 0 clear 22:32:33 0 some cloud 22:46:23 0 cloud above h 5 01:02:33 0 clear 01:17:33 0 clear 01:32:33 0 clear 01:47:33 II 2 4 15 25 clear 02:02:33 II 3 4 15 35 clear 02:17:33 II 3 5 15 >35 clear 02:31:24 I,II 4 8 355 >35 clear 02:45:53 I 3 11 >35 clear 03:00:19 NLC 1 15 clear 03:15:10 0 clear 03:30:02 0 cloud on left to h 10 03:45:01 0 cloud on left to h 15 04:00:01 X cloud on left 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: 2018/08/08-09 Start: 01:45 End: 03:00 Forms: I,II Max elevation: 15 Max brightness: 4 Comments: Clear. http://www.chiandh.eu/nlccam/20180808-09.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
The periods of absence of NLC are reported to the NLC Observers' Home Page:
Name: Horst Meyerdierks Country: Scotland Location: Edinburgh Date: 2018/08/08-09 Start: 20:45 End: 01:30 Comments: mostly clear
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) -------- ------ ----- ----- ----- ----- ----- ------------------- 01:47:33 60.000 22.3 -15.8 -5.4 2.7 0-255 q4216.jpg 02:02:33 60.000 25.9 -14.9 -4.9 4.1 0-255 q4222.jpg 02:17:33 60.000 29.5 -13.9 -4.3 5.9 0-255 q4228.jpg 02:31:24 30.000 32.8 -12.9 -3.8 8.6 0-255 q4233.jpg 02:45:53 15.000 36.1 -11.8 -3.1 13.4 0-255 q4239.jpg 03:00:19 4.000 39.4 -10.5 -2.3 24.9 0-255 q4243.jpg m4243.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).