NLC 2016-07-18/19
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: 2016-07-18/19
UT forms bright height azimuth comments
ness top bot left rght e.g. weather
-------- ----- ------ --- --- ---- ---- --------------------------------
21:30:05 X patchy cloud
21:45:06 X patchy cloud
22:00:07 X patchy cloud
22:15:10 X almost overcast
22:30:19 X almost overcast
22:45:19 X almost overcast
23:00:32 X almost overcast
23:15:53 X widespread cloud
23:30:48 X widespread cloud
23:45:47 X widespread cloud
00:00:47 X widespread cloud
00:16:23 X patchy cloud
00:30:47 X cloud to h 10
00:45:46 X patchy cloud
01:00:47 NLC? 3 8 through cloud
01:15:53 X patchy cloud
01:30:32 X patchy cloud to h 20
01:45:32 NLC? 3 13 through cirrus
02:00:19 II 2 20 through cirrus
02:15:10 II,III 2 25 through cirrus
02:30:03 II,III 1 40 some cirrus below
02:45:05 II,III 1 40 some cloud below
03:00:01 0 somc cloud to h 10
03:15:01 0 cloud to h 10 or 15
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: 2016/07/18-19
Start: 01:00
End: 02:45
Forms: II,III
Max elevation: 40
Max brightness: 3
Comments: Some cloud.
http://www.chiandh.eu/nlccam/20160718-19.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) -------- ------ ----- ----- ----- ----- ----- ------------------- 01:00:47 15.000 10.0 -12.8 -3.7 9.1 0-255 q4639.jpg m4639.jpg 01:45:32 8.000 20.6 -11.1 -2.7 18.0 0-255 q4657.jpg m4657.jpg 02:00:19 4.000 24.0 -10.3 -2.1 28.4 0-255 q4661.jpg m4661.jpg 02:15:10 2.000 27.4 -9.4 -1.5 61.0 0-255 q4664.jpg m4664.jpg 02:30:03 1.000 30.8 -8.4 -0.7 130.9 0-255 q4666.jpg m4666.jpg 02:45:05 0.500 34.1 -7.3 0.3 158.5 0-255 q4669.jpg m4669.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).
