NLC 2018-06-30/31
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: 2018-06-30/31
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:45:00 0 almost clear
22:00:01 0 almost clear
22:15:02 0 almost clear
22:30:02 0 few cloud patches
22:45:02 0 few cloud patches
23:00:10 0 almost clear
23:15:18 0 almost clear
23:30:18 0 almost clear
23:45:32 I 1 10 10 30 some cloud patches
00:00:32 I 1 12 10 35 some cloud patches
00:15:32 IV 2 10 10 35 some cloud patches
00:30:32 II 2 10 15 >35 patchy cloud
00:45:32 II 2 10 patchy cloud above h 10
01:00:19 0 patchy cloud above h 10
01:15:18 0 patchy cloud h 10 to 30
01:30:10 0 patchy cloud h 10 ro 25
01:45:03 0 patchy cloud to h 20
02:00:02 0 patchy cloud to h 20
02:15:01 0 patchy cloud to h 20
02:30:02 0 patchy cloud
02:45:01 0 patchy cloud
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: 2018/06/30-31
Start: 23:45
End: 00:45
Forms: I,II,IV
Max elevation: 12
Max brightness: 2
Comments: Some cloud.
http://www.chiandh.eu/nlccam/20180630-31.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: 2018/06/30-31 Start: 21:45 End: 23:30 Comments: almost clear Name: Horst Meyerdierks Country: Scotland Location: Edinburgh Date: 2018/06/30-31 Start: 01:00 End: 02:45 Comments: patchy cloud
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) -------- ------ ----- ----- ----- ----- ----- ------------------- 23:45:32 8.000 352.8 -10.7 -2.4 23.0 0-255 q0442.jpg m0442.jpg 00:00:32 8.000 356.3 -10.9 -2.5 20.5 0-255 q0446.jpg m0446.jpg 00:15:32 8.000 359.8 -11.0 -2.5 19.7 0-255 q0451.jpg m0451.jpg 00:30:32 8.000 3.3 -10.9 -2.5 20.3 0-255 q0456.jpg m0456.jpg 00:45:32 8.000 6.8 -10.7 -2.4 22.5 0-255 q0461.jpg m0461.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).
