NLC 2018-06-22/23
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: 2018-06-22/23
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:01 0 patchy cloud to h 20
22:00:05 0 patchy cloud to h 20
22:15:05 X patchy cloud to h 20 or 25
22:30:07 X patchy cloud to h 20 or 30
22:45:08 X patchy cloud
23:00:09 NLC? patchy cloud
23:15:10 I 2 through cloud
23:30:03 I,II 3 through cloud
23:45:09 I,II,III 3 through cloud
00:00:10 II,III 3 18 <325 35 through cloud
00:15:18 II,III 3 20 <325 >35 through cloud
00:30:10 I,II,IV 4 20 <325 >35 through cloud
00:45:10 I,IV 4 25 <325 cloud to h 5 or 10
01:00:09 I,IV 4 25 <325 cloud to h 5 or 10
01:15:10 I,II 3 30 <325 10 patchy cloud
01:30:09 II 2 through cloud
01:45:09 X widespread patchy cloud
02:00:06 X widespread patchy cloud
02:15:05 X widespread cloud
02:30:05 X widespread cloud
02:45:04 X almost 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: 2018/06/22-23
Start: 23:00
End: 01:30
Forms: I,II,III,IV
Max elevation: 30
Max brightness: 4
Comments: Through cloud.
http://www.chiandh.eu/nlccam/20180622-23.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 23:00:09 2.000 342.7 -9.1 -1.2 88.2 0-255 q9955.jpg m9955.jpg 23:15:10 2.000 346.1 -9.6 -1.7 50.4 0-255 q9957.jpg m9957.jpg 23:30:03 1.000 349.6 -10.1 -2.0 34.5 0-255 q9959.jpg 23:45:09 2.000 353.1 -10.4 -2.2 27.4 0-255 q9964.jpg 00:00:10 2.000 356.6 -10.6 -2.3 24.3 0-255 q9968.jpg 00:15:18 4.000 0.1 -10.6 -2.3 23.4 0-255 q9973.jpg 00:30:10 2.000 3.6 -10.6 -2.3 24.4 0-255 q9976.jpg 00:45:10 2.000 7.1 -10.4 -2.2 27.6 0-255 q9980.jpg 01:00:09 2.000 10.5 -10.1 -2.0 34.8 0-255 q9984.jpg 01:15:10 2.000 14.0 -9.6 -1.6 51.4 0-255 q9988.jpg 01:30:09 2.000 17.4 -9.1 -1.2 90.0 0-255 q9991.jpg m9991.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).
