NLC 2018-07-29/30
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: 2018-07-29/30
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:00:01 X widespread cloud
21:15:02 0 some cloud
21:30:05 NLC 1 20 350 30 cloud below, some above
21:45:09 II,IV 2 40 325 30 some cloud patches
22:00:19 II,IV 2 30 <325 35 some cloud patches on right
22:15:32 II,IV 3 20 <325 some cloud patches on right
22:30:53 II,IV 3 15 <325 25 some cloud patches
22:46:25 IV 3 12 <325 20 some cloud patches
23:01:24 IV 3 10 <325 through cloud
23:16:24 NLC 3 5 through cloud
23:31:24 NLC 3 5 through cloud
23:46:24 NLC 2 through cloud
00:01:24 X widespread cloud
00:16:24 X cloud to h 15 or 20
00:31:25 X cloud to h 10 or 15
00:46:24 X widespread cloud
01:01:24 X widespread cloud
01:16:24 NLC 3 through cloud
01:31:24 NLC 3 through cloud
01:45:47 X almost overcast
02:00:47 X overcast
02:16:30 X overcast
02:30:32 X overcast
02:45:19 X overcast
03:00:08 X overcast
03:15:06 X almost overcast
03:30:05 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: 2018/07/29-30
Start: 21:30
End: 01:30
Forms: II,IV
Max elevation: 40
Max brightness: 3
Comments: Increasing amount of cloud.
http://www.chiandh.eu/nlccam/20180729-30.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 21:30:05 0.500 320.0 -7.4 0.2 157.3 0-255 q3095.jpg m3095.jpg 21:45:09 2.000 323.3 -8.7 -1.0 115.4 0-255 q3097.jpg 22:00:19 4.000 326.8 -9.9 -1.9 38.8 0-255 q3100.jpg 22:15:32 8.000 330.2 -11.0 -2.6 18.8 0-255 q3104.jpg 22:30:53 15.000 333.8 -12.1 -3.2 11.9 0-255 q3110.jpg 22:46:25 30.000 337.5 -13.0 -3.8 8.5 0-255 q3116.jpg 23:01:24 30.000 341.0 -13.7 -4.2 6.4 0-255 q3122.jpg 23:16:24 30.000 344.6 -14.3 -4.6 5.1 0-255 q3128.jpg 23:31:24 30.000 348.3 -14.8 -4.8 4.2 0-255 q3134.jpg 23:46:24 30.000 351.9 -15.2 -5.0 3.6 0-255 q3140.jpg m3140.jpg 01:16:24 30.000 14.0 -14.5 -4.7 4.7 0-255 q3176.jpg m3176.jpg 01:31:24 30.000 17.6 -14.0 -4.4 5.8 0-255 q3182.jpg m3182.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).
