
NLC 2018-08-09/10
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: 2018-08-09/10 UT forms bright height azimuth comments ness top bot left rght e.g. weather -------- ----- ------ --- --- ---- ---- -------------------------------- 20:30:04 0 clear, out of focus 20:45:05 0 clear 21:00:05 0 clear 21:15:10 0 clear 21:30:32 0 almost clear 21:45:53 0 some cloud 22:01:23 X widespread cloud 22:16:24 X patchy cloud 22:31:25 X patchy cloud 22:46:24 0 cloud above h 15 02:01:24 II 2 3 30 35 cloud above h 5 02:16:24 NLC through cloud 02:30:47 NLC through cloud 02:45:53 X patchy cloud 03:00:33 X widespread cloud 03:15:19 X almost overcast 03:30:08 X almost overcast 03:45:06 X overcast 04:00:05 X overcast 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: 2018/08/09-10 Start: 02:00 End: 02:30 Forms: II Max elevation: 3 Max brightness: 2 Comments: Through cloud. http://www.chiandh.eu/nlccam/20180809-10.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 02:01:24 30.000 25.8 -15.2 -5.1 3.5 0-255 q4299.jpg 02:16:24 30.000 29.4 -14.3 -4.5 5.2 0-255 q4305.jpg m4305.jpg 02:30:47 15.000 32.8 -13.2 -3.9 7.6 0-255 q4310.jpg m4310.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).